java - 大 pdf 文件 OutOfMemoryError

Question

我有字节数组需要作为文件返回到前端。为此，我使用 IOUtils.write 但如果文件大于 15-20MB，它会抛出:失败； error='无法分配内存' (errno=12) 并且我的 Tomcat 7 死机了。

我需要重新启动它才能开始工作。

Tomcat 以 1.5GB RAM 和双核 CPU 开始

这是我的代码:

OutputStream outputStream = null;
        try{
            outputStream = response.getOutputStream();
            IOUtils.write(imgbytes, outputStream);
            outputStream.flush();
        }catch(IOException ioException){
            logger.error("IO ERROR - ", ioException);
        }finally{
            if(outputStream != null){
                try {
                    outputStream.close();
                } catch (IOException e) {
                    logger.error("Error closing stream - ", e);
                }
            }
        }

这里是错误:

[2016-11-21 04:07:02] ERROR [http-bio-8080-exec-7] org.fwo.controller.FileController (FileController.java:43) - IO ERROR - 
ClientAbortException:  java.net.SocketException: Connection reset
    at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:413)
    at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:371)
    at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:438)
    at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:426)
    at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:91)
    at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:84)
    at org.apache.commons.io.IOUtils.write(IOUtils.java:1177)
    at org.fwo.controller.FileController.getFile(FileController.java:40)
    at sun.reflect.GeneratedMethodAccessor403.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:212)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:427)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:315)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.net.SocketException: Connection reset
    at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:118)
    at java.net.SocketOutputStream.write(SocketOutputStream.java:159)
    at org.apache.coyote.http11.InternalOutputBuffer.realWriteBytes(InternalOutputBuffer.java:215)
    at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:480)
    at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:366)
    at org.apache.coyote.http11.InternalOutputBuffer$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:520)
    at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:408)
    ... 45 more
started
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000007c1780000, 95420416, 0) failed; error='Cannot allocate memory' (errno=12)
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (malloc) failed to allocate 95420416 bytes for committing reserved memory.
# An error report file with more information is saved as:
# /tmp/hs_err_pid4983.log

Answer 1

错误消息说您的 native 内存不足，所以我猜测您在 Windows 上运行的是 32 位 JVM。

一个 32 位进程有 4GB 的可寻址内存，而 Windows 通常会为自己保留 2GB，所以你剩下 2GB 的用户内存。您的堆占用了其中的 1.5 GB，因此 native 分配的堆外内存空间所剩无几。

解决方案:要么将堆大小减少到 1GB 以便为堆外内存腾出更多空间，要么切换到 64 位 JVM。