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

Question

我正在尝试从 Oracle 调用 jasper 报告

ADF

。我已将以下

jar

文件包含到类路径中

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

下面是我用来调用报告的代码

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();

当我运行代码时，出现以下错误：

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。我缺少一个罐子吗？

Answer 1

只需重新启动 JDeveloper 并构建项目，问题就解决了。类路径中缺少类文件。