JasperReports在Unix环境下的Weblogic部署问题

昨天把项目发布到测试服务器上面去，可报表老是出不来，报错也很奇怪：

java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:280)
at com.linkage.struts.BaseAction.execute(BaseAction.java:92)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1006)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:28)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at org.extremecomponents.table.filter.AbstractExportFilter.doFilter(AbstractExportFilter.java:49)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at com.linkage.pub.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:99)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java :6724)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3764)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2644)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
Caused by: java.lang.InternalError: Can't connect to X11 window server using ':0.0' as the value of the DISPLAY variable.
at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
at sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:139)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:141)
at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:62)
at net.sf.jasperreports.engine.util.JRGraphEnvInitializer.initializeGraphEnv(JRGraphEnvInitializer.java :58)
at net.sf.jasperreports.engine.fill.JRBaseFiller.<init>(JRBaseFiller.java:311)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:92)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:74)
at net.sf.jasperreports.engine.fill.JRFiller.createFiller(JRFiller.java:147)
at net.sf.jasperreports.engine.fill.JRFiller.fillReport(JRFiller.java:83)
at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:601)
at com.linkage.mobile.report.logic.JasperReportUtil.fillData(JasperReportUtil.java:78)
at com.linkage.mobile.report.action.TradeReportAction.fillDate(TradeReportAction.java:119)
at com.linkage.mobile.report.action.TradeReportAction.queryTradeReport(TradeReportAction.java:35)

然后开始一步一步加输出文字调试，最后把问题锁定在JasperReports的JasperFillManager类的fillReport方法上。然后开始上网到处找资料，弄到今天下午才有点头绪，后来我们组的一个兄弟也过来帮忙，最后终于才把问题给解决。原来是Unix/Linux下，JapserReport在weblogic中默认是显示不了的。必须把weblogic的配置文件startWeblogic.sh里面加上一条命令“-Djava.awt.headless=true”。真不容易，赶紧记下。