I have installed Tomcat6 in Ubuntu OS and when I run my web application the server gets crashed at regular intervals. I have tried a lot but not getting the solution. I have increased the memory upto 2048mb but still getting such error. Following is the error I am getting. Any help would be really appreciated.

org.apache.tomcat.util.http.Parameters processParametersINFO: 
Invalid chunk starting at byte [312] and ending at byte [312] with a value of    [null] 
ignoredException in thread "Timer-1" Exception in thread "com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0" Exception in thread
"com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2" Exception in thread    
"com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1" Exception in thread 
"Timer-2" Exception in thread "http-8080-4" Exception in thread "http-8080-8" Exception in    thread 
"http-8080-17" Exception in thread "org.hibernate.cache.StandardQueryCache.data"   Exception in thread 
"org.hibernate.cache.UpdateTimestampsCache.data" Exception in thread 
"org.hibernate.cache.StandardQueryCache.data" Exception in thread   
"org.hibernate.cache.StandardQueryCache.data" Exception in thread 
"org.hibernate.cache.UpdateTimestampsCache.data" Exception in thread 
"org.hibernate.cache.StandardQueryCache.data" Exception in thread 
"org.hibernate.cache.StandardQueryCache.data" Exception in thread 
"org.hibernate.cache.UpdateTimestampsCache.data" Exception in thread "com.safenet.usermgmt.User.data" 
Exception in thread "http-8080-7" Exception in thread  "http-8080-12" Exception in thread "http-8080-16" 
Exception in thread "http-8080-14"   Exception in thread "http-8080-13" Exception in thread "http-8080-15" 
Exception in thread   "http-8080-6" 
OpenJDK Client VM warning: Exception java.lang.OutOfMemoryError occurred   dispatching signal SIGTERM to handler- the VM may need to be forcibly terminated