hi Everton Daniel,
maybe you can check out http://www.tersus.com/#Id=7135
i had a similar problem like yours.you can try the below and see if any works for you1) play around with the java virtual machine settings -Xmx, -Xms. check out 3. Performance & Security Considerations in http://www.tersus.com/#Id=242
2) remove all -Xmx, -Xms settings for Tomcat and Java virtual machine
3) if your server is 64 bit, if possible try increase more physical RAM and try without any Xmx, -Xms settings for Tomcat and Java virtual machine
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