你好堆栈溢出，
如果我尝试在jsf应用程序中使用servlet过滤器，则会出现以下异常。如果没有Servlet过滤器，应用程序将顺利运行。 我使用的是apache tomcat 7.0.4版。
java.lang.NullPointerException
at org.apache.tomcat.util.http.MimeHeaders.clear(MimeHeaders.java:151)
at org.apache.coyote.Response.recycle(Response.java:536)
at org.apache.coyote.http11.AbstractOutputBuffer.nextRequest(AbstractOutputBuffer.java:280)
at org.apache.coyote.http11.InternalOutputBuffer.nextRequest(InternalOutputBuffer.java:144)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1081)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
Exception in thread "http-bio-8084-exec-2" java.lang.NullPointerException
at org.apache.tomcat.util.http.MimeHeaders.clear(MimeHeaders.java:151)
at org.apache.coyote.Response.recycle(Response.java:536)
at org.apache.coyote.http11.AbstractOutputBuffer.nextRequest(AbstractOutputBuffer.java:280)
at org.apache.coyote.http11.InternalOutputBuffer.nextRequest(InternalOutputBuffer.java:144)
at org.apache.coyote.http11.AbstractOutputBuffer.recycle(AbstractOutputBuffer.java:265)
at org.apache.coyote.http11.InternalOutputBuffer.recycle(InternalOutputBuffer.java:131)
at org.apache.coyote.http11.AbstractHttp11Processor.recycle(AbstractHttp11Processor.java:1709)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.release(Http11Protocol.java:140)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:654)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
ClientAbortException: java.net.SocketException: Socket closed
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:406)
at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:480)
at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:366)
at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:431)
at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:419)
at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:91)
at java.nio.channels.Channels$WritableByteChannelImpl.write(Channels.java:458)
at com.sun.faces.application.resource.ResourceHandlerImpl.handleResourceRequest(ResourceHandlerImpl.java:343)
at javax.faces.application.ResourceHandlerWrapper.handleResourceRequest(ResourceHandlerWrapper.java:153)
at org.primefaces.application.PrimeResourceHandler.handleResourceRequest(PrimeResourceHandler.java:132)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:643)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.aircell.abs.acpu.maintenance.LoginFilter.doFilter(Unknown Source)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
Caused by: java.net.SocketException: Socket closed
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:116)
at java.net.SocketOutputStream.write(SocketOutputStream.java:153)
at org.apache.coyote.http11.InternalOutputBuffer.realWriteBytes(InternalOutputBuffer.java:215)
at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:480)
at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:366)
at org.apache.coyote.http11.InternalOutputBuffer$OutputStreamOutputBuffer.doWrite(InternalOutputBuffer.java:240)
at org.apache.coyote.http11.filters.ChunkedOutputFilter.doWrite(ChunkedOutputFilter.java:119)
at org.apache.coyote.http11.AbstractOutputBuffer.doWrite(AbstractOutputBuffer.java:192)
at org.apache.coyote.Response.doWrite(Response.java:517)
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:401)
... 28 more
java.lang.IllegalStateException: Cannot change buffer size after data has been written
at org.apache.catalina.connector.ResponseFacade.setBufferSize(ResponseFacade.java:254)
at com.sun.faces.context.ExternalContextImpl.setResponseBufferSize(ExternalContextImpl.java:910)
at com.sun.faces.application.resource.ResourceHandlerImpl.handleResourceRequest(ResourceHandlerImpl.java:328)
at javax.faces.application.ResourceHandlerWrapper.handleResourceRequest(ResourceHandlerWrapper.java:153)
at org.primefaces.application.PrimeResourceHandler.handleResourceRequest(PrimeResourceHandler.java:132)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:643)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.aircell.abs.acpu.maintenance.LoginFilter.doFilter(Unknown Source)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:363)
at org.apache.coyote.http11.InternalOutputBuffer$OutputStreamOutputBuffer.doWrite(InternalOutputBuffer.java:240)
at org.apache.coyote.http11.filters.ChunkedOutputFilter.end(ChunkedOutputFilter.java:167)
at org.apache.coyote.http11.AbstractOutputBuffer.endRequest(AbstractOutputBuffer.java:310)
at org.apache.coyote.http11.InternalOutputBuffer.endRequest(InternalOutputBuffer.java:157)
at org.apache.coyote.http11.AbstractHttp11Processor.endRequest(AbstractHttp11Processor.java:1680)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1067)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
它还会导致应用程序以不正确的方式呈现。 （比如缺少css）和有时非常难看的渲染。
我的servletfilter代码：
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
* Servlet Filter implementation class LoginFilter
*/
@WebFilter("/loginfilter")
public class LoginFilter implements Filter {
String value = null;
/**
* Default constructor.
*
*/
Object username;
HttpServletRequest req;
HttpServletResponse res;
HttpSession session;
BeanForLogin bean;
public LoginFilter() {
// TODO Auto-generated constructor stub
System.out.println("inside constructor");
}
/**
* @see Filter#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
}
/**
* @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
*/
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) {
// TODO Auto-generated method stub
// place your code here
// pass the request along the filter chain
//System.out.println("Inside login filter");
req = (HttpServletRequest) request;
res = (HttpServletResponse)response;
session = req.getSession(true);
System.out.println("Session = " +session);
username = session.getAttribute("username");
res.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // HTTP 1.1.
res.setHeader("Pragma", "no-cache"); // HTTP 1.0.
res.setDateHeader("Expires", 0); // Proxies.
if((username == null) && (req.getServletPath().contains("/faces/") (!req.getServletPath().contains("login_new.xhtml")))
{
System.out.println("inside if");
System.out.println(req.getRequestURL() + "\n" + req.getServletPath());
res.sendRedirect(req.getContextPath() + "/faces/login_new.xhtml");
return;
}
else
{
System.out.println("inside else");
chain.doFilter(req, res);
return;
}
}
/**
* @see Filter#init(FilterConfig)
*/
public void init(FilterConfig fConfig) throws ServletException {
// TODO Auto-generated method stub
}
}
问题是，有时页面按预期加载。但有时它是非常不合适的。确切地说，它是不一致的。
在这方面，任何帮助都表示赞赏！
提前致谢