The resource did not process correctly

java.lang.NullPointerException
	at CompressionFilter.doFilter(CompressionFilter.java:28)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:253)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:211)
	at setcacheexpire.doFilter(setcacheexpire.java:133)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:253)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:211)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:167)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:757)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:577)
	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:158)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:757)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:577)
	at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:369)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:239)
	at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:520)
	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:217)
	at org.glassfish.grizzly.http.server.HttpHandler$1.run(HttpHandler.java:200)
	at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:569)
	at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:549)
	at java.base/java.lang.Thread.run(Thread.java:829)