我有一个Web应用程序,它由以前在Linux机器上运行的一些JSP组成。我需要在运行Tomcat 5.5.29的Windows XP SP3机器上运行它。现在大多数所有的东西都在工作,但这一项:应用程序有能力将配置文件写入其Windows目录(即C:\ Program Files \ Apache \ Tomcat \ webapps \ myapp)。但是当它尝试这样做时,应用程序无法打开FileOutputStream(返回null)。如果我放弃路径说明符,并让它打开文件,它会在Tomcat目录中成功打开它。为JSP/Tomcat/Windows设置目录权限
第一行失败,但第二个成功:
// outputFile2 = new PrintWriter(new FileOutputStream(basePathName + "programAll.txt", false));
outputFile2 = new PrintWriter(new FileOutputStream("programAll.txt", false));
下面是创建的basePathName的代码:
String basePathName = getBaseFilePath();
...
public String getBaseFilePath()
{
String curDir = System.getProperty("catalina.home");
curDir = curDir + "/webapps/pubmed/";
curDir = "file:///" + formatPathNameForOS(curDir);
return curDir;
}
public String formatPathNameForOS(String pathName)
{
if (codeIsOnWindows())
{
pathName = pathName.replace('/','\\');
}
else
{
pathName = pathName.replace('\\','/');
}
return pathName;
}
这里的异常消息:
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error() that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:460)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:321)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:257)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
root cause
java.lang.NullPointerException
org.apache.jsp.updateMemberLists_jsp._jspService(updateMemberLists_jsp.java:1492)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:321)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:257)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
以下是堆栈跟踪:
Aug 6, 2010 1:20:39 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
at org.apache.jsp.updateMemberLists_jsp._jspService(updateMemberLists_jsp.java:1492)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:321)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:257)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.globus.tomcat.coyote.valves.HTTPSValve55.invoke(HTTPSValve55.java:45)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:873)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:595)
我已经看过了updateMembersLists_jsp.java,并且这里是空指针发生的部分:
//create a file to write to the output
PrintWriter outputFile2 = null;
try
{
outputFile2 = new PrintWriter(new FileOutputStream(basePathName + "programAll.txt", false));
// outputFile2 = new PrintWriter(new FileOutputStream("programAll.txt", false));
}
catch (FileNotFoundException e)
{
out.write("<p><font color='red'>Error Saving</font></p>");
}
outputFile2.print(output); // THIS IS LINE 1492 -- NULL POINTER
outputFile2.close();
另外:我们现在运行Tomcat关闭根目录,而不是程序文件的。我检查了basePathName并且它正在被正确计算。
现在我发现Tomcat的策略设置可能需要调整。我在catalina.policy中添加了以下几行,希望它能够设置正确的内容:
// The permissions granted to the pubmed webapp
grant codeBase "file:${catalina.home}/webapps/pubmed/-" {
permission java.io.FilePermission "${catalina.home}/webapps/pubmed/-", "read, write";
permission java.io.FilePermission "${catalina.home}/webapps/pubmed/*", "read, write";
};
这似乎没有任何效果。 tomcat正在运行的Windows用户对pubmed目录具有读/写权限。除了这个webapp将文件写入自己的目录似乎有问题之外,我错过了什么?
肖恩
什么是basePathName? – naikus 2010-08-06 16:17:03
好问题。这是 文件:/// C:\ Program Files \ Apache Software Foundation \ Tomcat 5.5 \ webapps \ pubmed \ – BridgetG 2010-08-06 16:21:38
对不起另一个问题:你如何获得它? – naikus 2010-08-06 16:38:22