[CAY-2720] ConcurrentModificationException in the TypeAwareSQLTreeProcessor

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.2.M3
• Fix Version/s: 4.2.B1
• Component/s: Core Library
• Assignee: Nikita Timofeev
• Reporter: Nikita Timofeev
• Created: 08/Sep/21 14:44
• Updated: 08/Sep/21 14:46
• Resolved: 08/Sep/21 14:46

Description

Seems like TypeAwareSQLTreeProcessor could lead to a ConcurrentModificationException when it lazily computes processors for attributes.

Here's a stack trace:

 
Caused by: java.util.ConcurrentModificationException: null
	at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134)
	at org.apache.cayenne.access.sqlbuilder.sqltree.PerAttributeChildProcessor.process(PerAttributeChildProcessor.java:48)
	at org.apache.cayenne.access.translator.select.TypeAwareSQLTreeProcessor.onChildNodeStart(TypeAwareSQLTreeProcessor.java:88)
	at org.apache.cayenne.access.sqlbuilder.sqltree.Node.visit(Node.java:106)
	at org.apache.cayenne.access.sqlbuilder.sqltree.Node.visit(Node.java:109)
	at org.apache.cayenne.access.translator.select.TypeAwareSQLTreeProcessor.process(TypeAwareSQLTreeProcessor.java:61)
	at org.apache.cayenne.access.translator.select.SQLGenerationStage.perform(SQLGenerationStage.java:38)
	at org.apache.cayenne.access.translator.select.DefaultSelectTranslator.translate(DefaultSelectTranslator.java:98)
	at org.apache.cayenne.access.translator.select.DefaultSelectTranslator.getSql(DefaultSelectTranslator.java:104)
	at org.apache.cayenne.access.jdbc.SelectAction.performAction(SelectAction.java:87)
	at org.apache.cayenne.access.DataNodeQueryAction.runQuery(DataNodeQueryAction.java:97)
	at org.apache.cayenne.access.DataNode.performQueries(DataNode.java:273)