No subject

[Le Huy]

Can some one explain me why in stacktrace of hotspot  I see a thread
blocked without any information about lock record by mean what is
blocking it.

e.g.

---

   3 "ajp-0.0.0.0-8029-1082" daemon prio=10 tid=0x63721000 nid=0x2cba
waiting for monitor entry [0x4e619000]
    4    java.lang.Thread.State: BLOCKED (on object monitor)
    5         at java.lang.Class.forName0(Native Method)
    6         at java.lang.Class.forName(Class.java:186)
    7         at
com.my.security.SecurityMethodInterceptor$Rule.isAllowed(SecurityMethodInterceptor.java:102)
    8         at
com.my.security.SecurityMethodInterceptor.isAllowed(SecurityMethodInterceptor.java:163)
    9         at
com.my.security.SecurityMethodInterceptor.invoke(SecurityMethodInterceptor.java:140)
   10         at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
   11         at
org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
   12         at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
   13         at
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
   14         at $Proxy53.setPINValidated(Unknown Source)
   15         at sun.reflect.GeneratedMethodAccessor285.invoke(Unknown Source)
   16         at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   17         at java.lang.reflect.Method.invoke(Method.java:616)
   18         at
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
   19         at
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
   20         at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
   21         at
org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
   22         at
org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
   23         at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
   24         at
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
   ...
   removed because it is not relevant
---

Huy