我已部署了我的webapp但由于某些原因，在尝试将文件加载到服务器时会出现一些异常，我不知道为什么会发生这种情况。有时当我尝试上传文件rich:fileUpload没有上传文件时，组件的进度条永远不会被填充，并且Tomcat的日志中会出现如下例外：
may 21, 2012 8:38:04 PM org.richfaces.request.MultipartRequest25 parseIfNecessary
SEVERE: Exception parsing multipart request: Request prolog cannot be read
org.richfaces.exception.FileUploadException: Exception parsing multipart request: Request prolog cannot be read
at org.richfaces.request.MultipartRequestParser.parse(MultipartRequestParser.java:156)
at org.richfaces.request.MultipartRequest25.parseIfNecessary(MultipartRequest25.java:77)
at org.richfaces.request.MultipartRequest25.getParameter(MultipartRequest25.java:114)
at com.sun.faces.context.RequestParameterMap.get(RequestParameterMap.java:75)
at com.sun.faces.context.RequestParameterMap.get(RequestParameterMap.java:56)
at java.util.Collections$UnmodifiableMap.get(Collections.java:1339)
at com.sun.faces.application.view.MultiViewHandler.calculateRenderKitId(MultiViewHandler.java:220)
at javax.faces.application.ViewHandlerWrapper.calculateRenderKitId(ViewHandlerWrapper.java:155)
at com.sun.faces.context.FacesContextImpl.isPostback(FacesContextImpl.java:211)
at javax.faces.context.FacesContextWrapper.isPostback(FacesContextWrapper.java:402)
at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:188)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:116)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:964)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1824)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.io.IOException: Request prolog cannot be read
at org.richfaces.request.MultipartRequestParser.readProlog(MultipartRequestParser.java:270)
at org.richfaces.request.MultipartRequestParser.initialize(MultipartRequestParser.java:172)
at org.richfaces.request.MultipartRequestParser.parse(MultipartRequestParser.java:148)
... 30 more
may 21, 2012 8:38:04 PM org.richfaces.request.MultipartRequest25 parseIfNecessary
SEVERE: Exception parsing multipart request: Request prolog cannot be read
org.richfaces.exception.FileUploadException: Exception parsing multipart request: Request prolog cannot be read
at org.richfaces.request.MultipartRequestParser.parse(MultipartRequestParser.java:156)
at org.richfaces.request.MultipartRequest25.parseIfNecessary(MultipartRequest25.java:77)
at org.richfaces.request.MultipartRequest25.getParameter(MultipartRequest25.java:114)
at com.sun.faces.context.RequestParameterMap.get(RequestParameterMap.java:75)
at com.sun.faces.context.RequestParameterMap.get(RequestParameterMap.java:56)
at java.util.Collections$UnmodifiableMap.get(Collections.java:1339)
at com.sun.faces.application.view.MultiViewHandler.calculateRenderKitId(MultiViewHandler.java:220)
at javax.faces.application.ViewHandlerWrapper.calculateRenderKitId(ViewHandlerWrapper.java:155)
at com.sun.faces.context.FacesContextImpl.isPostback(FacesContextImpl.java:211)
at javax.faces.context.FacesContextWrapper.isPostback(FacesContextWrapper.java:402)
at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:188)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:116)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:473)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329)
at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:455)
at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:399)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:191)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:964)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1824)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.io.IOException: Request prolog cannot be read
at org.richfaces.request.MultipartRequestParser.readProlog(MultipartRequestParser.java:270)
at org.richfaces.request.MultipartRequestParser.initialize(MultipartRequestParser.java:172)
at org.richfaces.request.MultipartRequestParser.parse(MultipartRequestParser.java:148)
... 33 more
may 21, 2012 8:38:04 PM org.richfaces.request.MultipartRequest25 parseIfNecessary
SEVERE: Exception parsing multipart request: Request prolog cannot be read
org.richfaces.exception.FileUploadException: Exception parsing multipart request: Request prolog cannot be read
at org.richfaces.request.MultipartRequestParser.parse(MultipartRequestParser.java:156)
at org.richfaces.request.MultipartRequest25.parseIfNecessary(MultipartRequest25.java:77)
at org.richfaces.request.MultipartRequest25.getParameter(MultipartRequest25.java:114)
at com.sun.faces.context.RequestParameterMap.get(RequestParameterMap.java:75)
at com.sun.faces.context.RequestParameterMap.get(RequestParameterMap.java:56)
at java.util.Collections$UnmodifiableMap.get(Collections.java:1339)
at com.sun.faces.application.view.MultiViewHandler.calculateRenderKitId(MultiViewHandler.java:220)
at javax.faces.application.ViewHandlerWrapper.calculateRenderKitId(ViewHandlerWrapper.java:155)
at com.sun.faces.context.FacesContextImpl.isPostback(FacesContextImpl.java:211)
at javax.faces.context.FacesContextWrapper.isPostback(FacesContextWrapper.java:402)
at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:188)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:116)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:964)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1824)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.io.IOException: Request prolog cannot be read
at org.richfaces.request.MultipartRequestParser.readProlog(MultipartRequestParser.java:270)
at org.richfaces.request.MultipartRequestParser.initialize(MultipartRequestParser.java:172)
at org.richfaces.request.MultipartRequestParser.parse(MultipartRequestParser.java:148)
... 30 more
may 21, 2012 8:38:04 PM org.richfaces.request.MultipartRequest25 parseIfNecessary
SEVERE: Exception parsing multipart request: Request prolog cannot be read
org.richfaces.exception.FileUploadException: Exception parsing multipart request: Request prolog cannot be read
at org.richfaces.request.MultipartRequestParser.parse(MultipartRequestParser.java:156)
at org.richfaces.request.MultipartRequest25.parseIfNecessary(MultipartRequest25.java:77)
at org.richfaces.request.MultipartRequest25.getParameter(MultipartRequest25.java:114)
at com.sun.faces.context.RequestParameterMap.get(RequestParameterMap.java:75)
at com.sun.faces.context.RequestParameterMap.get(RequestParameterMap.java:56)
at java.util.Collections$UnmodifiableMap.get(Collections.java:1339)
at com.sun.faces.application.view.MultiViewHandler.calculateRenderKitId(MultiViewHandler.java:220)
at javax.faces.application.ViewHandlerWrapper.calculateRenderKitId(ViewHandlerWrapper.java:155)
at com.sun.faces.context.FacesContextImpl.isPostback(FacesContextImpl.java:211)
at javax.faces.context.FacesContextWrapper.isPostback(FacesContextWrapper.java:402)
at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:188)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:116)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:473)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329)
at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:455)
at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:399)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:191)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:964)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1824)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.io.IOException: Request prolog cannot be read
at org.richfaces.request.MultipartRequestParser.readProlog(MultipartRequestParser.java:270)
at org.richfaces.request.MultipartRequestParser.initialize(MultipartRequestParser.java:172)
at org.richfaces.request.MultipartRequestParser.parse(MultipartRequestParser.java:148)
... 33 more
对可能发生的事情有任何想法？我在哪里可以开始寻找在我的应用上修复此问题？
欢呼声，
答案 0 :(得分：3)
我的项目中有相同的堆栈跟踪。我可以解释为什么会发生这种情况以及解决问题的方法很少。
所以richfaces fileUpload组件假定还没有从其他地方读取多部分请求InputStream。但是，如果您的应用程序中有任何执行简单的过滤器
request.getParameter(anyParamName)这会强制多部分请求读取完整输入流并将所有内容放入request.getParts()集合中。
当richfaces fileupload尝试从输入流中读取内容时，它无法执行此操作，因为流游标位于末尾（这是在tomcat源中）并且只返回-1;这会导致richfaces认为它无法从流中读取任何内容。
要解决此问题，您可以删除强制多部分请求解析inputStream的所有过滤器。
此外，作为一个热修复，您可以尝试更改某些richfaces类，如MultipartRequest25或MultipartRequestParser。
我已为MultipartRequestParser添加了热修复程序，以检查请求是否已包含部件并尝试将部件解析为FileUploadParam。这非常hacky检查异常的消息，但它可以作为一个热修复。
jboss jira中存在未解决的问题，似乎是关于这个问题。你可以看看。我也在那里添加评论。 https://issues.jboss.org/browse/RF-13061
public void parse() throws FileUploadException {
try {
initialize();
while (!sequenceMatcher.isEOF()) {
readNext();
}
} catch (IOException e) {
if(e.getMessage().equals(REQUEST_PROLOG_CANNOT_BE_READ)){
//means it can not read request prolog. maybe application server already read everything and stores data in parts
try {
if(request.getParts()!=null && request.getParts().size()>0){
Collection<Part> parts = request.getParts();
//parts seem to be complete files so get the headers and so on here
//and create fileUploadItems from parts
for(Part part:parts){
String headersString = part.getHeader("content-disposition");
Multimap<String, String> headers = LinkedListMultimap.create();
String[] split = headersString.split("\r\n");
for (String headerString : split) {
parseParams(headerString, "; ", headers);
}
FileUploadParam param = createParam(headers);
if (param == null) {
continue;
}
param.create();
try{
int size = (int)part.getSize();
byte[] buf = new byte[size];
part.getInputStream().read(buf, 0, size);
param.handle(buf, size);
}finally{
param.complete();
}
if (param.isFileParam()) {
uploadedFiles.add(new UploadedFile25(param.getName(), param.getResource(), headers));
} else {
parametersMap.put(param.getName(), param.getValue());
}
}
//return from the method if everything was successfull
return;
}
} catch (Exception e1) {
this.cancel();
throw new IllegalStateException("Could get Parts from the request", e1);
}
}
this.cancel();
throw new FileUploadException(MessageFormat.format("Exception parsing multipart request: {0}", e.getMessage()), e);
}
}
public void parse() throws FileUploadException {
try {
initialize();
while (!sequenceMatcher.isEOF()) {
readNext();
}
} catch (IOException e) {
if(e.getMessage().equals(REQUEST_PROLOG_CANNOT_BE_READ)){
//means it can not read request prolog. maybe application server already read everything and stores data in parts
try {
if(request.getParts()!=null && request.getParts().size()>0){
Collection<Part> parts = request.getParts();
//parts seem to be complete files so get the headers and so on here
//and create fileUploadItems from parts
for(Part part:parts){
String headersString = part.getHeader("content-disposition");
Multimap<String, String> headers = LinkedListMultimap.create();
String[] split = headersString.split("\r\n");
for (String headerString : split) {
parseParams(headerString, "; ", headers);
}
FileUploadParam param = createParam(headers);
if (param == null) {
continue;
}
param.create();
try{
int size = (int)part.getSize();
byte[] buf = new byte[size];
part.getInputStream().read(buf, 0, size);
param.handle(buf, size);
}finally{
param.complete();
}
if (param.isFileParam()) {
uploadedFiles.add(new UploadedFile25(param.getName(), param.getResource(), headers));
} else {
parametersMap.put(param.getName(), param.getValue());
}
}
//return from the method if everything was successfull
return;
}
} catch (Exception e1) {
this.cancel();
throw new IllegalStateException("Could get Parts from the request", e1);
}
}
this.cancel();
throw new FileUploadException(MessageFormat.format("Exception parsing multipart request: {0}", e.getMessage()), e);
}
}