mirror of
https://github.com/alibaba/arthas.git
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Fix as.sh Java home selection and validation (#3273)
This commit is contained in:
hengyunabc
@@ -229,6 +229,64 @@ check_permission()
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}
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# 验证候选 Java，成功后才更新 JAVA_HOME 和对应的启动参数。
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try_java_home()
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{
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local java_home="$1"
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[ -n "$java_home" ] || return 1
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if [ ! -x "$java_home/bin/java" ]; then
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echo "[WARN] Skip JAVA_HOME '$java_home': bin/java is missing or not executable." >&2
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return 1
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fi
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local version_output
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if ! version_output=$("$java_home/bin/java" -version 2>&1); then
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echo "[WARN] Skip JAVA_HOME '$java_home': java -version failed." >&2
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return 1
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fi
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local java_version= line version
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local version_pattern='version[[:space:]]+"([^"]+)"'
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while IFS= read -r line; do
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if [[ "$line" =~ $version_pattern ]]; then
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version=${BASH_REMATCH[1]}
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[[ "$version" == 1.* ]] && version=${version#1.}
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if [[ "$version" =~ ^([0-9]+)($|[-._+]) ]]; then
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java_version=$((10#${BASH_REMATCH[1]}))
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break
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fi
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fi
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done <<< "$version_output"
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if [ -z "$java_version" ] || [ "$java_version" -lt 1 ]; then
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echo "[WARN] Skip JAVA_HOME '$java_home': unrecognized Java version." >&2
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return 1
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fi
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java_home=$(rreadlink "$java_home") || return 1
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local boot_classpath= candidate
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# 仅 Java 8 及以下需要 tools.jar；保留从 JRE 子目录向父 JDK 查找的行为。
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if [ "$java_version" -lt 9 ]; then
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local java_homes=("$java_home" "$java_home/.." "$java_home/../..")
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for candidate in "${java_homes[@]}"; do
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if [ -x "$candidate/bin/java" ] && [ -f "$candidate/lib/tools.jar" ]; then
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java_home=$(rreadlink "$candidate") || return 1
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boot_classpath="-Xbootclasspath/a:$java_home/lib/tools.jar"
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break
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fi
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done
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if [ -z "$boot_classpath" ]; then
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echo "[WARN] Skip JAVA_HOME '$java_home': Java $java_version requires a JDK with lib/tools.jar." >&2
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return 1
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fi
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fi
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JAVA_HOME=$java_home
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BOOT_CLASSPATH=$boot_classpath
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return 0
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}
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# reset arthas work environment
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# reset some options for env
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reset_for_env()
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@@ -239,73 +297,38 @@ reset_for_env()
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mkdir -p "${ARTHAS_LIB_DIR}" \
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|| exit_on_err 1 "create ${ARTHAS_LIB_DIR} fail."
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# if env define the JAVA_HOME, use it first
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# if is alibaba opts, use alibaba ops's default JAVA_HOME
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[ -z "${JAVA_HOME}" ] && [ -d /opt/taobao/java ] && JAVA_HOME=/opt/taobao/java
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local configured_java_home="${JAVA_HOME}"
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JAVA_HOME=
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BOOT_CLASSPATH=
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if [[ (-z "${JAVA_HOME}") && ( -e "/usr/libexec/java_home") ]]; then
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# for mac
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JAVA_HOME=`/usr/libexec/java_home`
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# 有效的显式配置优先；只有当前来源不可用时才查找下一个来源。
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if ! try_java_home "$configured_java_home" && [ -d /opt/taobao/java ]; then
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try_java_home /opt/taobao/java
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fi
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if [ -z "${JAVA_HOME}" ] && [ -x /usr/libexec/java_home ]; then
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local mac_java_home
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mac_java_home=$(/usr/libexec/java_home 2>/dev/null) && try_java_home "$mac_java_home"
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fi
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if [ -z "${JAVA_HOME}" ]; then
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# try to find JAVA_HOME from java command
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local JAVA_COMMAND_PATH=$( rreadlink $(type -p java) )
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JAVA_HOME=$(echo "$JAVA_COMMAND_PATH" | sed -n 's/\/bin\/java$//p')
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fi
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# iterater through candidates to find a proper JAVA_HOME at least contains tools.jar which is required by arthas.
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if [ ! -d "${JAVA_HOME}" ]; then
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JAVA_HOME_CANDIDATES=($(ps aux | grep java | grep -v 'grep java' | awk '{print $11}' | sed -n 's/\/bin\/java$//p'))
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for JAVA_HOME_TEMP in ${JAVA_HOME_CANDIDATES[@]}; do
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if [ -f "${JAVA_HOME_TEMP}/lib/tools.jar" ]; then
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JAVA_HOME=`rreadlink "${JAVA_HOME_TEMP}"`
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break
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fi
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done
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fi
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if [ -z "${JAVA_HOME}" ]; then
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exit_on_err 1 "Can not find JAVA_HOME, please set \$JAVA_HOME bash env first."
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fi
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# maybe 1.8.0_162 , 11-ea
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local JAVA_VERSION
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local IFS=$'\n'
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# remove \r for Cygwin
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local lines=$("${JAVA_HOME}"/bin/java -version 2>&1 | tr '\r' '\n')
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for line in $lines; do
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if [[ (-z $JAVA_VERSION) && ($line = *"version \""*) ]]
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then
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local ver=$(echo $line | sed -e 's/.*version "\(.*\)"\(.*\)/\1/; 1q')
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# on macOS, sed doesn't support '?'
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if [[ $ver = "1."* ]]
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then
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JAVA_VERSION=$(echo $ver | sed -e 's/1\.\([0-9]*\)\(.*\)/\1/; 1q')
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else
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JAVA_VERSION=$(echo $ver | sed -e 's/\([0-9]*\)\(.*\)/\1/; 1q')
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local java_command_path
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java_command_path=$(type -p java)
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if [ -n "$java_command_path" ] && java_command_path=$(rreadlink "$java_command_path"); then
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case "$java_command_path" in
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*/bin/java) try_java_home "${java_command_path%/bin/java}" ;;
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esac
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fi
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fi
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done
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# when java version less than 9, we can use tools.jar to confirm java home.
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# when java version greater than 9, there is no tools.jar.
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if [[ "$JAVA_VERSION" -lt 9 ]];then
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# possible java homes
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javaHomes=("${JAVA_HOME%%/}" "${JAVA_HOME%%/}/.." "${JAVA_HOME%%/}/../..")
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for javaHome in ${javaHomes[@]}
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do
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toolsJar="$javaHome/lib/tools.jar"
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if [ -f $toolsJar ]; then
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JAVA_HOME=$( rreadlink $javaHome )
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BOOT_CLASSPATH=-Xbootclasspath/a:$( rreadlink $toolsJar )
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break
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fi
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done
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[ -z "${BOOT_CLASSPATH}" ] && exit_on_err 1 "tools.jar was not found, so arthas could not be launched!"
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fi
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if [ -z "${JAVA_HOME}" ]; then
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local candidate
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while IFS= read -r candidate; do
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try_java_home "$candidate" && break
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done < <(ps aux | awk '$11 ~ /\/bin\/java$/ { sub(/\/bin\/java$/, "", $11); print $11 }')
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fi
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[ -n "${JAVA_HOME}" ] || exit_on_err 1 "Can not find a usable JAVA_HOME; see the candidate errors above."
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echo "[INFO] JAVA_HOME: ${JAVA_HOME}"
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# reset CHARSET for alibaba opts, we use GBK
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@@ -40,6 +40,10 @@ public class AsScriptTest {
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private Path javaCalls;
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private Path curlCalls;
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private Path download;
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private Path javaHome;
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private Path platformJavaHome;
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private Path macJavaHome;
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private Path discoveryCalls;
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private Map<String, String> environment;
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@Before
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@@ -50,6 +54,9 @@ public class AsScriptTest {
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javaCalls = temporaryFolder.newFile("java-calls").toPath();
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curlCalls = temporaryFolder.newFile("curl-calls").toPath();
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download = temporaryFolder.newFile("download.zip").toPath();
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discoveryCalls = temporaryFolder.newFile("discovery-calls").toPath();
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platformJavaHome = temporaryFolder.getRoot().toPath().resolve("platform-jdk");
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macJavaHome = temporaryFolder.getRoot().toPath().resolve("mac-java-home");
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createArchive(true);
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// 只暴露启动器所需命令，避免宿主机的 telnet、lsof 和 Java 进程影响结果。
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@@ -61,7 +68,16 @@ public class AsScriptTest {
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Files.createSymbolicLink(commands.resolve(command), Paths.get(new String(output, StandardCharsets.UTF_8).trim()));
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}
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writeExecutable(commands.resolve("telnet"), "exit 0\n");
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writeExecutable(commands.resolve("ps"), "case \"$*\" in *user=*) id -u -n;; *) echo 1234;; esac\n");
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writeExecutable(commands.resolve("ps"),
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"case \"$*\" in\n"
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+ " *user=*) id -u -n;;\n"
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+ " aux)\n"
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+ " printf 'ps\\n' >> \"$AS_TEST_DISCOVERY_CALLS\"\n"
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+ " if [[ -n $AS_TEST_PROCESS_JAVA_HOME ]]; then\n"
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+ " printf 'user 1234 0 0 0 0 ? Sl 00:00 0:00 %s/bin/java example.Main\\n' \"$AS_TEST_PROCESS_JAVA_HOME\"\n"
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+ " fi;;\n"
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+ " *) echo 1234;;\n"
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+ "esac\n");
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writeExecutable(commands.resolve("curl"),
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"printf '%s\\n' \"$*\" >> \"$AS_TEST_CURL_CALLS\"\n"
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+ "output=\n"
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@@ -77,12 +93,7 @@ public class AsScriptTest {
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+ " cp \"$AS_TEST_DOWNLOAD\" \"$output\"\n"
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+ "fi\n");
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Path javaHome = temporaryFolder.newFolder("jdk").toPath();
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Files.createDirectory(javaHome.resolve("bin"));
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writeExecutable(javaHome.resolve("bin/java"),
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"if [[ $1 == -version ]]; then echo 'openjdk version \"17.0.2\"' >&2; exit 0; fi\n"
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+ "printf '%s\\n' \"$*\" >> \"$AS_TEST_JAVA_CALLS\"\n");
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writeExecutable(javaHome.resolve("bin/jps"), "echo '1234 example.Main'\n");
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javaHome = createJavaHome(temporaryFolder.getRoot().toPath().resolve("jdk"), "17.0.2", false);
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Path project = Paths.get(System.getProperty("user.dir")).toAbsolutePath();
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while (project != null && !Files.isRegularFile(project.resolve("bin/as.sh"))) {
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@@ -90,6 +101,9 @@ public class AsScriptTest {
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}
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assertTrue("Cannot locate bin/as.sh", project != null);
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String script = new String(Files.readAllBytes(project.resolve("bin/as.sh")), StandardCharsets.UTF_8);
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// 隔离固定平台路径，保留完整 Java 初始化和启动流程。
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script = script.replace("/opt/taobao/java", platformJavaHome.toString())
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.replace("/usr/libexec/java_home", macJavaHome.toString());
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int mainCall = script.lastIndexOf("\nmain \"${@}\"");
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assertTrue("Cannot locate launcher entry point", mainCall >= 0);
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// 显式设置 umask，避免宿主设置影响权限断言；旧版本的 /tmp 仍隔离到测试目录。
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@@ -108,9 +122,172 @@ public class AsScriptTest {
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environment.put("AS_TEST_DOWNLOAD", download.toString());
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environment.put("AS_TEST_JAVA_CALLS", javaCalls.toString());
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environment.put("AS_TEST_CURL_CALLS", curlCalls.toString());
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environment.put("AS_TEST_DISCOVERY_CALLS", discoveryCalls.toString());
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environment.put("AS_TEST_TMP_DIR", temporaryFolder.newFolder("downloads").getAbsolutePath());
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}
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@Test
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public void invalidExplicitJavaHomeFallsBackToPlatform() throws Exception {
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Path fallback = createJavaHome(platformJavaHome, "11.0.27.26-AJDK", false);
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Path missing = temporaryFolder.getRoot().toPath().resolve("missing-jdk");
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Path empty = temporaryFolder.newFolder("empty-jdk").toPath();
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Path nonExecutable = createJavaHome(temporaryFolder.getRoot().toPath().resolve("non-executable"), "17", false);
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Files.setPosixFilePermissions(nonExecutable.resolve("bin/java"), PosixFilePermissions.fromString("rw-r--r--"));
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for (Path invalid : Arrays.asList(missing, empty, nonExecutable)) {
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environment.put("JAVA_HOME", invalid.toString());
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String output = runHelp(0);
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assertJavaHome(output, fallback);
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assertTrue(output, output.contains("bin/java is missing or not executable"));
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}
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assertEquals("", read(discoveryCalls));
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}
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@Test
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public void validExplicitJavaHomeAvoidsFallbackDiscovery() throws Exception {
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Path fallback = createJavaHome(platformJavaHome, "11", false);
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useMacJava(fallback);
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Files.createSymbolicLink(commands.resolve("java"), fallback.resolve("bin/java"));
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environment.put("AS_TEST_PROCESS_JAVA_HOME", fallback.toString());
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String output = runHelp(0);
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assertJavaHome(output, javaHome);
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assertFalse(output, output.contains("[WARN]"));
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assertEquals("", read(discoveryCalls));
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}
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@Test
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public void platformJavaTakesPrecedenceOverMacAndPath() throws Exception {
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environment.put("JAVA_HOME", "");
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Path fallback = createJavaHome(platformJavaHome, "11", false);
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useMacJava(javaHome);
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Files.createSymbolicLink(commands.resolve("java"), javaHome.resolve("bin/java"));
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assertJavaHome(runHelp(0), fallback);
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assertEquals("", read(discoveryCalls));
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}
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@Test
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public void macJavaTakesPrecedenceOverPath() throws Exception {
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environment.put("JAVA_HOME", "");
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useMacJava(javaHome);
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Path pathJava = createJavaHome(temporaryFolder.getRoot().toPath().resolve("path-jdk"), "21", false);
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Files.createSymbolicLink(commands.resolve("java"), pathJava.resolve("bin/java"));
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assertJavaHome(runHelp(0), javaHome);
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assertEquals("mac\n", read(discoveryCalls));
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}
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@Test
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public void failedMacLookupFallsBackToPath() throws Exception {
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environment.put("JAVA_HOME", "");
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writeExecutable(macJavaHome, "exit 1\n");
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Files.createSymbolicLink(commands.resolve("java"), javaHome.resolve("bin/java"));
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assertJavaHome(runHelp(0), javaHome);
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}
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@Test
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public void pathWithSpacesAndSymlinkWorksWithoutOptionalPlatformPaths() throws Exception {
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environment.put("JAVA_HOME", "");
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Path path = temporaryFolder.newFolder("path with spaces").toPath();
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Files.createSymbolicLink(path.resolve("java"), javaHome.resolve("bin/java"));
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environment.put("PATH", path + File.pathSeparator + commands);
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String output = runHelp(0);
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assertJavaHome(output, javaHome);
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assertFalse(output, output.contains("[WARN]"));
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assertEquals("", read(discoveryCalls));
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}
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@Test
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public void processFallbackAcceptsModernJavaWithoutToolsJar() throws Exception {
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environment.put("JAVA_HOME", temporaryFolder.getRoot().toPath().resolve("missing-jdk").toString());
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Path processJava = createJavaHome(temporaryFolder.getRoot().toPath().resolve("process-jdk"), "11", false);
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environment.put("AS_TEST_PROCESS_JAVA_HOME", processJava.toString());
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assertJavaHome(runHelp(0), processJava);
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assertEquals("ps\n", read(discoveryCalls));
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}
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@Test
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public void failedVersionCommandIsRejectedEvenWithRecognizableOutput() throws Exception {
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Path fallback = createJavaHome(platformJavaHome, "11", false);
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writeJava(javaHome, "openjdk version \"17.0.2\"", 42);
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String output = runHelp(0);
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assertJavaHome(output, fallback);
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assertTrue(output, output.contains("java -version failed"));
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}
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@Test
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public void invalidVersionsFallBackInsteadOfAssumingJava8() throws Exception {
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Path fallback = createJavaHome(platformJavaHome, "11", false);
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for (String version : Arrays.asList("", "unrecognized vendor output", "openjdk version \"0\"",
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"openjdk version \"invalid\"")) {
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writeJava(javaHome, version, 0);
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String output = runHelp(0);
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assertJavaHome(output, fallback);
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assertTrue(output, output.contains("unrecognized Java version"));
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}
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}
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@Test
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public void modernJavaVersionsDoNotNeedToolsJar() throws Exception {
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for (String version : Arrays.asList("9", "11.0.27.26-AJDK", "11-ea", "17.0.15", "21.0.7", "25")) {
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writeJava(javaHome, "openjdk version \"" + version + "\"\r\nOpenJDK Runtime Environment\r", 0);
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assertJavaHome(runHelp(0), javaHome);
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}
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}
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@Test
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public void java8AndNestedJreUseJdkToolsJarWithSpaces() throws Exception {
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Path jdk = createJavaHome(temporaryFolder.getRoot().toPath().resolve("jdk8 with spaces"), "1.8.0_402", true);
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Path jre = createJavaHome(jdk.resolve("jre"), "1.8.0_402", false);
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Path nestedJre = createJavaHome(jre.resolve("nested"), "1.8.0_402", false);
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Path arthas = cache("4.3.5");
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for (Path candidate : Arrays.asList(jdk, jre, nestedJre)) {
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Files.write(javaCalls, new byte[0]);
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environment.put("JAVA_HOME", candidate.toString());
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environment.put("BOOT_CLASSPATH", "-Xbootclasspath/a:/stale/tools.jar");
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assertJavaHome(run(0, "--arthas-home", arthas.toString(), "--attach-only", "1234"), jdk);
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String calls = read(javaCalls);
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assertTrue(calls, calls.contains("-Xbootclasspath/a:" + jdk.resolve("lib/tools.jar")));
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assertFalse(calls, calls.contains("/stale/tools.jar"));
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}
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}
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@Test
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public void java8WithoutUsableParentJdkFallsBack() throws Exception {
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Path fallback = createJavaHome(platformJavaHome, "11", false);
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Path parent = temporaryFolder.newFolder("jdk8-without-java").toPath();
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Files.createDirectories(parent.resolve("lib"));
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Files.createFile(parent.resolve("lib/tools.jar"));
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Path jre = createJavaHome(parent.resolve("jre"), "1.8.0_402", false);
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environment.put("JAVA_HOME", jre.toString());
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String output = runHelp(0);
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assertJavaHome(output, fallback);
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assertTrue(output, output.contains("requires a JDK with lib/tools.jar"));
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}
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@Test
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public void modernJavaClearsInheritedBootClasspathBeforeAttach() throws Exception {
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environment.put("BOOT_CLASSPATH", "-Xbootclasspath/a:/stale/tools.jar");
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Path arthas = cache("4.3.5");
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assertJavaHome(run(0, "--arthas-home", arthas.toString(), "--attach-only", "1234"), javaHome);
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assertFalse(read(javaCalls), read(javaCalls).contains("-Xbootclasspath"));
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}
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@Test
|
||||
public void inheritedBootClasspathCannotMakeInvalidJavaUsable() throws Exception {
|
||||
environment.put("JAVA_HOME", temporaryFolder.getRoot().toPath().resolve("missing-jdk").toString());
|
||||
environment.put("BOOT_CLASSPATH", "-Xbootclasspath/a:/stale/tools.jar");
|
||||
String output = runHelp(1);
|
||||
assertTrue(output, output.contains("Can not find a usable JAVA_HOME"));
|
||||
assertFalse(output, output.contains("tools.jar was not found, so arthas could not be launched!"));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void unknownVersionReportsSelectionFailureBeforeDownloadOrAttach() throws Exception {
|
||||
writeJava(javaHome, "unrecognized vendor output", 0);
|
||||
String output = runHelp(1);
|
||||
assertTrue(output, output.contains("unrecognized Java version"));
|
||||
assertTrue(output, output.contains("Can not find a usable JAVA_HOME"));
|
||||
assertFalse(output, output.contains("tools.jar was not found, so arthas could not be launched!"));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void choosesNewestNumericCachedVersion() throws Exception {
|
||||
cache("4.3.9");
|
||||
@@ -325,6 +502,10 @@ public class AsScriptTest {
|
||||
command.addAll(Arrays.asList(arguments));
|
||||
Path output = temporaryFolder.newFile().toPath();
|
||||
ProcessBuilder builder = new ProcessBuilder(command).directory(temporaryFolder.getRoot());
|
||||
for (String variable : Arrays.asList("BOOT_CLASSPATH", "BASH_ENV", "ENV", "JAVA_TOOL_OPTIONS", "_JAVA_OPTIONS",
|
||||
"JDK_JAVA_OPTIONS")) {
|
||||
builder.environment().remove(variable);
|
||||
}
|
||||
builder.environment().putAll(environment);
|
||||
builder.redirectErrorStream(true).redirectOutput(output.toFile());
|
||||
Process process = builder.start();
|
||||
@@ -337,6 +518,47 @@ public class AsScriptTest {
|
||||
return text;
|
||||
}
|
||||
|
||||
private String runHelp(int expectedExit) throws Exception {
|
||||
String output = run(expectedExit, "--help");
|
||||
assertEquals("Java selection must not invoke download commands", "", read(curlCalls));
|
||||
assertEquals("Java selection must not invoke attach or client commands", "", read(javaCalls));
|
||||
if (expectedExit == 0) {
|
||||
assertTrue(output, output.contains("Usage:"));
|
||||
}
|
||||
return output;
|
||||
}
|
||||
|
||||
private void assertJavaHome(String output, Path expected) throws IOException {
|
||||
assertTrue(output, output.contains("[INFO] JAVA_HOME: " + expected.toRealPath() + "\n"));
|
||||
}
|
||||
|
||||
private Path createJavaHome(Path home, String version, boolean tools) throws IOException {
|
||||
Files.createDirectories(home.resolve("bin"));
|
||||
writeJava(home, "openjdk version \"" + version + "\"", 0);
|
||||
writeExecutable(home.resolve("bin/jps"), "echo '1234 example.Main'\n");
|
||||
if (tools) {
|
||||
Files.createDirectories(home.resolve("lib"));
|
||||
Files.createFile(home.resolve("lib/tools.jar"));
|
||||
}
|
||||
return home.toRealPath();
|
||||
}
|
||||
|
||||
private void writeJava(Path home, String versionOutput, int exitCode) throws IOException {
|
||||
writeExecutable(home.resolve("bin/java"),
|
||||
"if [[ $1 == -version ]]; then\n"
|
||||
+ " printf '%s\\n' '" + versionOutput.replace("'", "'\\''") + "' >&2\n"
|
||||
+ " exit " + exitCode + "\n"
|
||||
+ "fi\n"
|
||||
+ "printf '%s\\n' \"$*\" >> \"$AS_TEST_JAVA_CALLS\"\n");
|
||||
}
|
||||
|
||||
private void useMacJava(Path home) throws IOException {
|
||||
environment.put("AS_TEST_MAC_JAVA_HOME", home.toString());
|
||||
writeExecutable(macJavaHome,
|
||||
"printf 'mac\\n' >> \"$AS_TEST_DISCOVERY_CALLS\"\n"
|
||||
+ "printf '%s\\n' \"$AS_TEST_MAC_JAVA_HOME\"\n");
|
||||
}
|
||||
|
||||
private void assertHome(String output, Path home) {
|
||||
assertTrue(output, output.contains("Arthas home: " + home + "\n"));
|
||||
}
|
||||
|
||||
@@ -37,6 +37,22 @@ curl -L https://arthas.aliyun.com/install.sh | sh
|
||||
|
||||
也可以执行`./as.sh -h`来获取更多参数信息。
|
||||
|
||||
`as.sh` 按以下顺序查找可用的 Java，选中后停止查找：
|
||||
|
||||
1. 环境变量 `JAVA_HOME`。
|
||||
2. `/opt/taobao/java`（目录存在时）。
|
||||
3. macOS 的 `/usr/libexec/java_home` 返回的目录。
|
||||
4. `PATH` 中的 `java`，解析软链接后确定安装目录。
|
||||
5. 运行中 Java 进程的安装目录（需要进程列表中包含完整的 `/bin/java` 路径）。
|
||||
|
||||
每个候选目录都需要包含可执行的 `bin/java`，并且 `java -version` 执行成功、版本可以识别。Java 8 及以下还需要 `lib/tools.jar`；如果 `JAVA_HOME` 指向 JRE 子目录，脚本会向上查找最多两级，选择包含 `tools.jar` 和可执行 `bin/java` 的 JDK。Java 9 及以上不需要 `tools.jar`。
|
||||
|
||||
有效的 `JAVA_HOME` 始终优先。已配置的目录失效时，脚本会输出原因并继续查找；全部候选不可用时，会在下载或 attach 之前退出。可以为单次启动指定 Java：
|
||||
|
||||
```bash
|
||||
JAVA_HOME="/path/to/jdk" ./as.sh
|
||||
```
|
||||
|
||||
## 全量安装
|
||||
|
||||
最新版本，点击下载：[](https://arthas.aliyun.com/download/latest_version?mirror=aliyun)
|
||||
|
||||
@@ -29,6 +29,22 @@ The command above will download the bootstrap script `as.sh` to the current dire
|
||||
|
||||
You can enter its interactive interface by executing `as.sh`, or execute `as.sh -h` for more help information.
|
||||
|
||||
`as.sh` searches for a usable Java installation in the following order and stops at the first valid candidate:
|
||||
|
||||
1. The `JAVA_HOME` environment variable.
|
||||
2. `/opt/taobao/java`, if the directory exists.
|
||||
3. The directory returned by `/usr/libexec/java_home` on macOS.
|
||||
4. The `java` command on `PATH`, resolving symbolic links to locate its installation directory.
|
||||
5. The installation directories of running Java processes, when the process list contains their full `/bin/java` paths.
|
||||
|
||||
Each candidate must contain an executable `bin/java`, and `java -version` must succeed and report a recognizable version. Java 8 and earlier also require `lib/tools.jar`. If `JAVA_HOME` points to a JRE subdirectory, the script searches up to two parent directories for a JDK containing both `tools.jar` and an executable `bin/java`. Java 9 and later do not require `tools.jar`.
|
||||
|
||||
A valid `JAVA_HOME` always takes precedence. If a configured installation is invalid, the script reports the reason and continues searching. If no candidate is usable, it exits before downloading or attaching. To select Java for a single invocation:
|
||||
|
||||
```bash
|
||||
JAVA_HOME="/path/to/jdk" ./as.sh
|
||||
```
|
||||
|
||||
## Full installation
|
||||
|
||||
Latest Version, Click To Download: [](https://arthas.aliyun.com/download/latest_version)
|
||||
|
||||
Reference in New Issue
Block a user