Exception in thread "com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThrea

Exception in thread "com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2" java.lang.OutOfMemoryError: PermGen space
	at java.lang.Class.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
	at java.lang.Class.getMethod0(Class.java:2670)
	at java.lang.Class.getMethod0(Class.java:2679)
	at java.lang.Class.getMethod(Class.java:1603)
	at com.mchange.v2.c3p0.impl.C3P0ImplUtils.supportsMethod(C3P0ImplUtils.java:309)
	at com.mchange.v2.c3p0.impl.NewPooledConnection.(NewPooledConnection.java:104)
	at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:198)
	at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)
	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)
	at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)
	at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)
	at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)
	at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
     :   Spring           
  
        
		
		
		
		
		
		
		
		
		
		
		
    

java.lang.OutOfMemoryError: PermGen space 
              。

PermGen space    Permanent Generation space,           , 
        JVM  Class Meta   ,Class  Loader      PermGen space , 
       (Instance) Heap    ,GC(Garbage Collection)           
PermGen space    ，            CLASS  ,      PermGen space  , 
       web    JSP  pre compile   。    WEB APP          jar,     
   jvm     (4M)            。 
    ：     MaxPermSize   

  TOMCAT_HOME/bin/catalina.sh 
 “echo "Using CATALINA_BASE:   $CATALINA_BASE"”       ： 
JAVA_OPTS="-server -XX:PermSize=64M -XX:MaxPermSize=128m 

           ，                。