Possible fix

src/main/java/io/ebeaninternal/api/ManyWhereJoins.java

@@ -7,7 +7,9 @@ import io.ebean.util.SplitName;
 import io.ebeaninternal.server.query.SqlJoinType;
 
 import java.io.Serializable;
+import java.util.ArrayList;
 import java.util.Collection;
+import java.util.List;
 import java.util.TreeMap;
 import java.util.TreeSet;
 
@@ -21,9 +23,7 @@ public class ManyWhereJoins implements Serializable {
 
   private final TreeMap<String, PropertyJoin> joins = new TreeMap<>();
 
-  private StringBuilder formulaProperties = new StringBuilder();
-
-  private boolean formulaWithJoin;
+  private List<String> formulaJoinProperties;
 
   private boolean aggregation;
 
@@ -125,27 +125,24 @@ public class ManyWhereJoins implements Serializable {
    * specifically for the findCount query.
    */
   public void addFormulaWithJoin(String propertyName) {
-    if (formulaWithJoin) {
-      formulaProperties.append(",");
-    } else {
-      formulaProperties = new StringBuilder();
-      formulaWithJoin = true;
+    if (formulaJoinProperties == null) {
+      formulaJoinProperties = new ArrayList<>();
     }
-    formulaProperties.append(propertyName);
+    formulaJoinProperties.add(propertyName);
   }
 
   /**
    * Return true if the query select includes a formula with join.
    */
   public boolean isFormulaWithJoin() {
-    return formulaWithJoin;
+    return formulaJoinProperties != null;
   }
 
   /**
    * Return the formula properties to build the select clause for a findCount query.
    */
-  public String getFormulaProperties() {
-    return formulaProperties.toString();
+  public List<String> getFormulaJoinProperties() {
+    return formulaJoinProperties;
   }
 
   /**

src/main/java/io/ebeaninternal/server/el/ElPropertyChain.java

@@ -136,8 +136,7 @@ public class ElPropertyChain implements ElPropertyValue {
 
   @Override
   public boolean containsFormulaWithJoin() {
-    // Not cascading the check at this stage
-    return false;
+    return lastBeanProperty.containsFormulaWithJoin();
   }
 
   @Override

src/main/java/io/ebeaninternal/server/query/CQueryBuilder.java

@@ -265,7 +265,9 @@ class CQueryBuilder {
     if (!countDistinct) {
       // minimise select clause for standard count
       if (manyWhereJoins.isFormulaWithJoin()) {
-        query.select(manyWhereJoins.getFormulaProperties());
+        // FIXME: we join the strings here and on the other side we split them again
+        // this is not yet optimal
+        query.select(String.join(",",manyWhereJoins.getFormulaJoinProperties()));
       } else {
         query.setSelectId();
       }

src/main/java/io/ebeaninternal/server/query/SqlTreeBuilder.java

@@ -296,6 +296,13 @@ public final class SqlTreeBuilder {
       SqlTreeNodeManyWhereJoin nodeJoin = new SqlTreeNodeManyWhereJoin(joinProp.getProperty(), beanProperty, joinProp.getSqlJoinType());
       myJoinList.add(nodeJoin);
     }
+    if (manyWhereJoins.isFormulaWithJoin()) {
+      for (String property: manyWhereJoins.getFormulaJoinProperties()) {
+        STreeProperty beanProperty = desc.findPropertyFromPath(property);
+        SqlTreeNodeFormulaWhereJoin nodeJoin = new SqlTreeNodeFormulaWhereJoin(beanProperty, SqlJoinType.OUTER);
+        myJoinList.add(nodeJoin);
+      }
+    }
   }
 
   private SqlTreeNode buildNode(String prefix, STreePropertyAssoc prop, STreeType desc, List<SqlTreeNode> myList, SqlTreeProperties props) {

src/main/java/io/ebeaninternal/server/query/SqlTreeNodeFormulaWhereJoin.java

@@ -0,0 +1,115 @@
+package io.ebeaninternal.server.query;
+
+import io.ebean.Version;
+import io.ebean.bean.EntityBean;
+import io.ebeaninternal.api.SpiQuery;
+import io.ebeaninternal.server.deploy.DbReadContext;
+import io.ebeaninternal.server.deploy.DbSqlContext;
+import io.ebeaninternal.server.type.ScalarType;
+
+import java.util.List;
+import java.util.Set;
+
+/**
+ * Join to Many (or child of a many) to support where clause predicates on many properties.
+ */
+class SqlTreeNodeFormulaWhereJoin implements SqlTreeNode {
+
+  private final STreeProperty nodeBeanProp;
+
+  /**
+   * The many where join which is either INNER or OUTER.
+   */
+  private final SqlJoinType manyJoinType;
+
+  SqlTreeNodeFormulaWhereJoin(STreeProperty prop, SqlJoinType manyJoinType) {
+    this.nodeBeanProp = prop;
+    this.manyJoinType = manyJoinType;
+  }
+
+  @Override
+  public boolean isSingleProperty() {
+    return true;
+  }
+
+  @Override
+  public ScalarType<?> getSingleAttributeReader() {
+    throw new IllegalStateException("No expected");
+  }
+
+  @Override
+  public void addAsOfTableAlias(SpiQuery<?> query) {
+    // do nothing here ...
+  }
+
+  @Override
+  public void addSoftDeletePredicate(SpiQuery<?> query) {
+    // do nothing here ...
+  }
+
+  @Override
+  public boolean isAggregation() {
+    return false;
+  }
+
+  @Override
+  public void appendDistinctOn(DbSqlContext ctx, boolean subQuery) {
+    // do nothing here ...
+  }
+
+  @Override
+  public void appendGroupBy(DbSqlContext ctx, boolean subQuery) {
+    // do nothing here
+  }
+
+  /**
+   * Append to the FROM clause for this node.
+   */
+  @Override
+  public void appendFrom(DbSqlContext ctx, SqlJoinType currentJoinType) {
+
+    // always use the join type as per this many where join
+    // (OUTER for disjunction and otherwise INNER)
+    nodeBeanProp.appendFrom(ctx, manyJoinType);
+  }
+
+
+
+  @Override
+  public void dependentTables(Set<String> tables) {
+    //FIXME: we cannot easily determine the dependent tables, this would require an enhancement
+    //of the @Formula(dependentTables=...) annotation
+  }
+
+  @Override
+  public void buildRawSqlSelectChain(List<String> selectChain) {
+    // nothing to add
+  }
+
+  @Override
+  public void appendSelect(DbSqlContext ctx, boolean subQuery) {
+    // nothing to do here
+  }
+
+  @Override
+  public void appendWhere(DbSqlContext ctx) {
+    // nothing to do here
+  }
+
+  @Override
+  public EntityBean load(DbReadContext ctx, EntityBean localBean, EntityBean parentBean) {
+    // nothing to do here
+    return null;
+  }
+
+  @Override
+  public <T> Version<T> loadVersion(DbReadContext ctx) {
+    // nothing to do here
+    return null;
+  }
+
+  @Override
+  public boolean hasMany() {
+    return true;
+  }
+}