Thread being blocked without information about what is blocking it

[Le Huy]

Hi

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