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From "Yasser Zamani (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (WW-4817) Threads get blocked due to unnecessary synchronization in OgnlRuntime
Date Wed, 14 Mar 2018 12:44:00 GMT

    [ https://issues.apache.org/jira/browse/WW-4817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16398513#comment-16398513
] 

Yasser Zamani commented on WW-4817:
-----------------------------------

I see both {{LoginAction.java:122}} are executed. It seems the blocking has been occurred
after that in your manager.

Oh and about why your app works with ognl 3.0.6: I somehow can recall that ognl 3.0.20 and
older ones synchronize on *+first call+* of the action method rather than if method is public
or not, but 3.0.21 and newer ones check this first then synchronize if was needed (isn't needed
in your case). It seems this somehow can guess why you see such difference between these versions.

I think you may consider putting your action method code inside a synchronized block and see
what happens.

> Threads get blocked due to unnecessary synchronization in OgnlRuntime
> ---------------------------------------------------------------------
>
>                 Key: WW-4817
>                 URL: https://issues.apache.org/jira/browse/WW-4817
>             Project: Struts 2
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.3.32, 2.5.12
>            Reporter: Santhana Preethi J
>            Assignee: Lukasz Lenart
>            Priority: Major
>             Fix For: 2.3.34, 2.5.13
>
>         Attachments: ThreadBlock.war, threadDump.txt
>
>
> In multi-threaded scenario, due to unnecessary synchronization in invokeMethod method
in OgnlRuntime class all threads except the first go to BLOCKED state.
> {code:java}
> public static Object invokeMethod(Object target, Method method, Object[] argsArray)
>     throws InvocationTargetException, IllegalAccessException
>   { 
> .......
>  synchronized (method) {
>       if ((_methodAccessCache.get(method) == null) || (_methodAccessCache.get(method)
== Boolean.TRUE))
>       {
>         syncInvoke = true;
>       }
> .......
>     }
> {code}
> Because *syncInvoke* becomes true for the first thread irrespective of whether the method
is public or not, all other threads go to block state till the first thread leaves the method
invocation synchronization block.
> Attached threadDump of the blocked threads waiting to lock the monitor 0x00000006c690e5b8
even though the method invoked by the action is public.
> {code:java}
> "_###_Thread-1499929571461_###_http-nio-8443-exec-20" #374 daemon prio=5 os_prio=0 tid=0x00007f830513a000
nid=0x49c1 waiting for monitor entry [0x00007f7e9c7c2000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
> 	at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:826)
> 	- waiting to lock <0x00000006c690e5b8> (a java.lang.reflect.Method)
> 	at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1294)
> 	at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
> 	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)
> 	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)
> 	at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1370)
> 	at ognl.ASTMethod.getValueBody(ASTMethod.java:91)
> 	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
> 	at ognl.SimpleNode.getValue(SimpleNode.java:258)
> 	at ognl.Ognl.getValue(Ognl.java:467)
> 	at ognl.Ognl.getValue(Ognl.java:431)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil$3.execute(OgnlUtil.java:352)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecuteMethod(OgnlUtil.java:404)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil.callMethod(OgnlUtil.java:350)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:430)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:290)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:251)
> 	at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:168)
> 	.........
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	..........
> 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
> 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
> 	at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:240)
> 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
> 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
> 	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)
> 	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
> 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1533)
> 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1489)
> 	- locked <0x00000006c5249d98> (a org.apache.tomcat.util.net.NioChannel)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> 	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
> 	at java.lang.Thread.run(Thread.java:748)
> "Thread-1499929605769_###_Thread-1499929605766_###_http-nio-8443-exec-19" #373 daemon
prio=5 os_prio=0 tid=0x00007f8305138000 nid=0x49c0 waiting for monitor entry [0x00007f7e9c8c3000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
> 	at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:826)
> 	- waiting to lock <0x00000006c690e5b8> (a java.lang.reflect.Method)
> 	at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1294)
> 	at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
> 	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)
> 	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)
> 	at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1370)
> 	at ognl.ASTMethod.getValueBody(ASTMethod.java:91)
> 	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
> 	at ognl.SimpleNode.getValue(SimpleNode.java:258)
> 	at ognl.Ognl.getValue(Ognl.java:467)
> 	at ognl.Ognl.getValue(Ognl.java:431)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil$3.execute(OgnlUtil.java:352)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecuteMethod(OgnlUtil.java:404)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil.callMethod(OgnlUtil.java:350)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:430)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:290)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:251)
> 	........
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	.........
> 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
> 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
> 	at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:240)
> 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
> 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
> 	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)
> 	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
> 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1533)
> 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1489)
> 	- locked <0x00000006c844cea8> (a org.apache.tomcat.util.net.NioChannel)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> 	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
> 	at java.lang.Thread.run(Thread.java:748)
> "Thread-1499929651452_###_Thread-1499929651449_###_http-nio-8443-exec-17" #371 daemon
prio=5 os_prio=0 tid=0x00007f8305134000 nid=0x49be waiting for monitor entry [0x00007f7e9cac4000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
> 	at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:826)
> 	- waiting to lock <0x00000006c690e5b8> (a java.lang.reflect.Method)
> 	at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1294)
> 	at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
> 	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)
> 	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)
> 	at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1370)
> 	at ognl.ASTMethod.getValueBody(ASTMethod.java:91)
> 	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
> 	at ognl.SimpleNode.getValue(SimpleNode.java:258)
> 	at ognl.Ognl.getValue(Ognl.java:467)
> 	at ognl.Ognl.getValue(Ognl.java:431)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil$3.execute(OgnlUtil.java:352)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecuteMethod(OgnlUtil.java:404)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil.callMethod(OgnlUtil.java:350)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:430)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:290)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:251)
> 	........
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	.........
> 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
> 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
> 	at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:240)
> 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
> 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
> 	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)
> 	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
> 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1533)
> 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1489)
> 	- locked <0x00000006c8605150> (a org.apache.tomcat.util.net.NioChannel)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> 	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
> 	at java.lang.Thread.run(Thread.java:748)
> "Thread-1499929544435_###_Thread-1499929544432_###_http-nio-8443-exec-13" #367 daemon
prio=5 os_prio=0 tid=0x00007f830512c800 nid=0x49ba runnable [0x00007f7e9cec6000]
>    java.lang.Thread.State: RUNNABLE
> 	at java.net.SocketInputStream.socketRead0(Native Method)
> 	at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
> 	at java.net.SocketInputStream.read(SocketInputStream.java:171)
> 	at java.net.SocketInputStream.read(SocketInputStream.java:141)
> 	at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:114)
> 	at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:161)
> 	at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:189)
> 	- locked <0x00000006c7201d08> (a com.mysql.jdbc.util.ReadAheadInputStream)
> 	at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3014)
> 	at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3467)
> 	at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3456)
> 	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3997)
> 	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2468)
> 	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2629)
> 	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2713)
> 	- locked <0x00000006c6a0cdd0> (a com.mysql.jdbc.JDBC4Connection)
> 	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2663)
> 	at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1599)
> 	- locked <0x00000006c6a0cdd0> (a com.mysql.jdbc.JDBC4Connection)
> 	.........
> 	at sun.reflect.GeneratedMethodAccessor44.invoke(Unknown Source)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	.........
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	..........
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:871)
> 	- locked <0x00000006c690e5b8> (a java.lang.reflect.Method)
> 	at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1294)
> 	at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
> 	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)
> 	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)
> 	at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1370)
> 	at ognl.ASTMethod.getValueBody(ASTMethod.java:91)
> 	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
> 	at ognl.SimpleNode.getValue(SimpleNode.java:258)
> 	at ognl.Ognl.getValue(Ognl.java:467)
> 	at ognl.Ognl.getValue(Ognl.java:431)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil$3.execute(OgnlUtil.java:352)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecuteMethod(OgnlUtil.java:404)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil.callMethod(OgnlUtil.java:350)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:430)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:290)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:251)
> 	..........
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	...........
> 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
> 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
> 	at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:240)
> 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
> 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
> 	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)
> 	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
> 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1533)
> 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1489)
> 	- locked <0x00000006c52e67a8> (a org.apache.tomcat.util.net.NioChannel)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> 	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
> 	at java.lang.Thread.run(Thread.java:748)
> {code}
> Modified the syncInvoke checks to prevent this unnecessary blocking
> {code:java}
>  public static Object invokeMethod(Object target, Method method, Object[] argsArray)
>     throws InvocationTargetException, IllegalAccessException
>   {
>     boolean syncInvoke = false;
>     boolean checkPermission = false;
>     boolean wasAccessible = true;
>     synchronized (method) {
>       if ((_methodAccessCache.get(method) == null))
>       {
>         if ((!Modifier.isPublic(method.getModifiers())) || (!Modifier.isPublic(method.getDeclaringClass().getModifiers())))
>         {
>           if (!(wasAccessible = method.isAccessible()))
>           {
>              method.setAccessible(true);
>             _methodAccessCache.put(method, Boolean.TRUE);
>           }
>           else {
>             _methodAccessCache.put(method, Boolean.FALSE);
>           }
>         }
>         else {
>           _methodAccessCache.put(method, Boolean.FALSE);
>         }
>       }
>       if (_methodAccessCache.get(method) == Boolean.TRUE))
>       {
>         syncInvoke = true;
>       }
>       if (((_securityManager != null) && (_methodPermCache.get(method) == null))
|| (_methodPermCache.get(method) == Boolean.FALSE))
>       {
>         checkPermission = true;
>       }
>     }
>     Object result;
>     if (syncInvoke)
>     {
>       synchronized (method)
>       {
>         if (checkPermission)
>         {
>           try
>           {
>             _securityManager.checkPermission(getPermission(method));
>             _methodPermCache.put(method, Boolean.TRUE);
>           } catch (SecurityException ex) {
>             _methodPermCache.put(method, Boolean.FALSE);
>             throw new IllegalAccessException("Method [" + method + "] cannot be accessed.");
>           }
>         }
>         Object result = method.invoke(target, argsArray);
>         if (!wasAccessible)
>         {
>           method.setAccessible(false);
>         }
>       }
>     }
>     else {
>       if (checkPermission)
>       {
>         try
>         {
>           _securityManager.checkPermission(getPermission(method));
>           _methodPermCache.put(method, Boolean.TRUE);
>         } catch (SecurityException ex) {
>           _methodPermCache.put(method, Boolean.FALSE);
>           throw new IllegalAccessException("Method [" + method + "] cannot be accessed.");
>         }
>       }
>       result = method.invoke(target, argsArray);
>     }
>     return result;
>   }
> {code}



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