java.lang.NoClassDefFoundError：net/sf/jasperreports/engine/util/JRLoader

我试图从Oracle ADF调用jasper报告。我已经包括下列jar文件到类路径java.lang.NoClassDefFoundError：net/sf/jasperreports/engine/util/JRLoader

apache-ant-1.7.1.jar 
groovy-all-2.0.1.jar 
itext-2.1.7.js2.jar 
jasperreports-6.1.0.jar 
jasperreports-fonts-6.1.0.jar 
jasperreports-javaflow-6.1.0.jar 
jcommon-1.0.15.jar 
jfreechart-1.0.12.jar 
poi-3.10.1.jar

下面是我使用的调用报告的代码

HttpServletResponse response = getResponse(); 
      ServletOutputStream out = response.getOutputStream(); 
      response.setHeader("Cache-Control", "max-age=0"); 
      response.setContentType("application/pdf"); 
      ServletContext context = getContext(); 

      InputStream fs = new FileInputStream(new File(context.getRealPath("/reports/usman.jasper"))); 

      JasperReport template = (JasperReport) JRLoader.loadObject(fs); 
      template.setWhenNoDataType(WhenNoDataTypeEnum.ALL_SECTIONS_NO_DETAIL); 

     JasperPrint print; 
     print = JasperFillManager.fillReport(template, null); 
     ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
      JasperExportManager.exportReportToPdfStream(print, baos); 
      out.write(baos.toByteArray()); 
      out.flush(); 
      out.close(); 
     FacesContext.getCurrentInstance().responseComplete();

当我运行代码我得到以下错误：

Caused by: java.lang.NoClassDefFoundError: net/sf/jasperreports/engine/util/JRLoader 
    at Test.b2_action(Test.java:70) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at com.sun.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:181) 
    at com.sun.el.parser.AstValue.invoke(AstValue.java:289) 
    at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304) 
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105) 
    at org.apache.myfaces.trinidad.component.MethodExpressionMethodBinding.invoke(MethodExpressionMethodBinding.java:46) 
    ... 74 more

请帮我解决这个错误。我错过了一个罐子？

来源

2017-07-27 Usman Riaz

你有导入'JRLoader'吗？ – Lino

import net.sf.jasperreports.engine.util.JRLoader;是的 –

也许看看这个：https://stackoverflow.com/questions/34413/why-am-i-getting-a-noclassdeffounderror-in-java。你确定这个类在运行时可用吗？ – Lino

刚刚重新启动JDeveloper并构建项目并解决了问题。类路径中缺少类文件。

来源

2017-07-27 07:51:18

java.lang.NoClassDefFoundError：net/sf/jasperreports/engine/util/JRLoader

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