Takahito Kikuchi created SLING-3317:
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Summary: Concurrent access to WeakHashMap in ConcurrentCache
causes infinite loop, 100% CPU usage
Key: SLING-3317
URL: https://issues.apache.org/jira/browse/SLING-3317
Project: Sling
Issue Type: Bug
Components: Scripting
Reporter: Takahito Kikuchi
On a web application with Apache Sling Scripting JSP 2.0.24, 100% CPU usage
problem happened as following. It looks similar to the tomcat problem,
https://issues.apache.org/bugzilla/show_bug.cgi?id=50078
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java.lang.Thread.State: RUNNABLE
at java.util.WeakHashMap.get(WeakHashMap.java:470)
at org.apache.el.util.ConcurrentCache.get(ConcurrentCache.java:24)
at
org.apache.el.lang.ExpressionBuilder.createNodeInternal(ExpressionBuilder.java:90)
at
org.apache.el.lang.ExpressionBuilder.build(ExpressionBuilder.java:146)
at
org.apache.el.lang.ExpressionBuilder.createValueExpression(ExpressionBuilder.java:190)
at
org.apache.el.ExpressionFactoryImpl.createValueExpression(ExpressionFactoryImpl.java:68)
at
org.apache.sling.scripting.jsp.jasper.el.ExpressionEvaluatorImpl.parseExpression(ExpressionEvaluatorImpl.java:45)
at
org.apache.sling.scripting.jsp.jasper.el.ExpressionEvaluatorImpl.evaluate(ExpressionEvaluatorImpl.java:55)
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java.lang.Thread.State: RUNNABLE
at java.util.WeakHashMap.eq(WeakHashMap.java:343)
at java.util.WeakHashMap.put(WeakHashMap.java:521)
at java.util.WeakHashMap.putAll(WeakHashMap.java:640)
at org.apache.el.util.ConcurrentCache.put(ConcurrentCache.java:34)
at
org.apache.el.lang.ExpressionBuilder.createNodeInternal(ExpressionBuilder.java:123)
at
org.apache.el.lang.ExpressionBuilder.build(ExpressionBuilder.java:146)
at
org.apache.el.lang.ExpressionBuilder.createValueExpression(ExpressionBuilder.java:190)
at
org.apache.el.ExpressionFactoryImpl.createValueExpression(ExpressionFactoryImpl.java:68)
at
org.apache.sling.scripting.jsp.jasper.el.ExpressionEvaluatorImpl.parseExpression(ExpressionEvaluatorImpl.java:45)
at
org.apache.sling.scripting.jsp.jasper.el.ExpressionEvaluatorImpl.evaluate(ExpressionEvaluatorImpl.java:55)
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