feat(h2): add legacy 2.1 driver

agents/drivers/h2-legacy/build.gradle

@@ -0,0 +1,13 @@
+sourceSets {
+    main.java.srcDirs = ['src/main/java', '../h2/src/main/java']
+}
+
+dependencies {
+    implementation 'com.h2database:h2:2.1.214'
+}
+
+tasks.named('shadowJar') {
+    manifest {
+        attributes('Agent-Label': 'H2 2.1 Legacy', 'Main-Class': 'com.dbx.agent.h2legacy.H2LegacyAgent')
+    }
+}

agents/drivers/h2-legacy/src/main/java/com/dbx/agent/h2legacy/H2LegacyAgent.java

@@ -0,0 +1,10 @@
+package com.dbx.agent.h2legacy;
+
+import com.dbx.agent.JsonRpcServer;
+import com.dbx.agent.h2.H2Agent;
+
+public final class H2LegacyAgent extends H2Agent {
+    public static void main(String[] args) {
+        new JsonRpcServer(new H2LegacyAgent()).run();
+    }
+}

agents/drivers/h2/src/main/java/com/dbx/agent/h2/H2Agent.java

@@ -28,7 +28,7 @@ import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
 
-public final class H2Agent extends AbstractJdbcAgent {
+public class H2Agent extends AbstractJdbcAgent {
     private String databaseName = "";
 
     @Override

agents/scripts/validate_agents.py

@@ -17,6 +17,7 @@ NATIVE_ONLY_AGENT_MODULES = {
     "xugu": "drivers/xugu",
 }
 JDBC_ARCHITECTURE_ALLOWLIST = {
+    "h2-legacy": "reuses the H2 agent implementation with an isolated legacy driver version",
     "access": "custom Access metadata and URL behavior pending migration",
     "dameng": "custom Dameng metadata and DDL pending migration",
     "db2": "custom DB2 metadata pending migration",

agents/settings.gradle

@@ -4,7 +4,7 @@ def infrastructureModules = ['common', 'test-support']
 def driverModules = [
     'access', 'dameng', 'kingbase', 'vastbase', 'goldendb', 'databend', 'databricks', 'saphana',
     'teradata', 'vertica', 'firebird', 'exasol', 'oceanbase-oracle', 'gbase8a', 'gbase8s',
-    'bigquery', 'kylin', 'sundb', 'h2', 'snowflake', 'trino', 'hive', 'spark',
+    'bigquery', 'kylin', 'sundb', 'h2', 'h2-legacy', 'snowflake', 'trino', 'hive', 'spark',
     'db2', 'informix', 'neo4j', 'cassandra', 'mongodb', 'highgo', 'tdengine', 'yashandb', 'oscar',
     'iris', 'iotdb', 'etcd', 'zookeeper', 'kafka', 'sqlserver-legacy'
 ]

agents/versions.json

@@ -12,6 +12,7 @@
   "gbase8s": "0.1.19",
   "goldendb": "0.1.30",
   "h2": "0.1.30",
+  "h2-legacy": "0.1.0",
   "hive": "0.1.30",
   "spark": "0.1.2",
   "informix": "0.1.31",

apps/desktop/src/components/connection/ConnectionDialog.vue

@@ -647,6 +647,7 @@ const driverProfiles: Record<
   },
   dm: { type: "dameng", port: 5236, user: "SYSDBA", label: "DM (Dameng)", icon: "dm" },
   h2: { type: "h2", port: 9092, user: "sa", label: "H2", icon: "h2" },
+  "h2-legacy": { type: "h2", port: 9092, user: "sa", label: "H2 2.1 Legacy", icon: "h2" },
   snowflake: { type: "snowflake", port: 443, user: "", label: "Snowflake", icon: "snowflake" },
   trino: { type: "trino", port: 8080, user: "", label: "Trino", icon: "trino" },
   prestosql: { type: "prestosql", port: 8080, user: "", label: "PrestoSQL", icon: "presto" },
@@ -3985,6 +3986,30 @@ function openExternalUrl(url: string) {
                   </div>
                 </div>
 
+                <div v-if="form.db_type === 'h2'" class="grid grid-cols-4 items-center gap-4">
+                  <Label :class="connectionLabelSmallClass">Driver</Label>
+                  <div class="col-span-3 flex gap-2">
+                    <Button
+                      size="sm"
+                      :variant="form.driver_profile !== 'h2-legacy' ? 'default' : 'outline'"
+                      @click="
+                        form.driver_profile = 'h2';
+                        resetTestState();
+                      "
+                      >H2 2.3</Button
+                    >
+                    <Button
+                      size="sm"
+                      :variant="form.driver_profile === 'h2-legacy' ? 'default' : 'outline'"
+                      @click="
+                        form.driver_profile = 'h2-legacy';
+                        resetTestState();
+                      "
+                      >H2 2.1 Legacy</Button
+                    >
+                  </div>
+                </div>
+
                 <div v-if="h2DriverMissing" class="grid grid-cols-4 items-center gap-4">
                   <span />
                   <p class="col-span-3 text-xs text-muted-foreground">

crates/dbx-core/src/agent_catalog.rs

@@ -36,6 +36,9 @@ const MONGODB_PROFILES: &[AgentDriverProfile] = &[AgentDriverProfile {
     store_visible: false,
 }];
 
+const H2_PROFILES: &[AgentDriverProfile] =
+    &[AgentDriverProfile { profile: "h2-legacy", key: "h2-legacy", label: "H2 2.1 Legacy", store_visible: true }];
+
 const EXTRA_AGENT_LABELS: &[(&str, &str)] =
     &[("kafka", "Apache Kafka"), ("sqlserver-legacy", "SQL Server legacy compatibility component")];
 const EXTRA_DRIVER_STORE_ENTRIES: &[(&str, &str)] =
@@ -154,7 +157,7 @@ const AGENT_CATALOG: &[AgentCatalogEntry] = &[
         store_visible: true,
         profiles: ORACLE_PROFILES,
     },
-    AgentCatalogEntry { db_type: DatabaseType::H2, key: "h2", label: "H2", store_visible: true, profiles: &[] },
+    AgentCatalogEntry { db_type: DatabaseType::H2, key: "h2", label: "H2", store_visible: true, profiles: H2_PROFILES },
     AgentCatalogEntry {
         db_type: DatabaseType::Snowflake,
         key: "snowflake",
@@ -353,3 +356,16 @@ pub fn label_for_key(agent_key: &str) -> Option<&'static str> {
 fn entry_for_db_type(db_type: &DatabaseType) -> Option<&'static AgentCatalogEntry> {
     entries().iter().find(|entry| entry.db_type == *db_type)
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn h2_legacy_profile_uses_separate_agent() {
+        assert_eq!(agent_key(&DatabaseType::H2, None), Some("h2"));
+        assert_eq!(agent_key(&DatabaseType::H2, Some("h2")), Some("h2"));
+        assert_eq!(agent_key(&DatabaseType::H2, Some("h2-legacy")), Some("h2-legacy"));
+        assert!(driver_store_entries().any(|(key, label)| key == "h2-legacy" && label == "H2 2.1 Legacy"));
+    }
+}