java - 如何修复 "JRException: Error compiling report java source files"错误？

Question

搜索后，我发现可以将 XML 作为输入并将其设置为 PDF，但我收到此错误。 任何帮助将不胜感激。

@Service
public class PDFGenerationDemo implements Serializable {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    public static final String RESOURCES_DIR;
    public static final String OUTPUT_DIR;

    static {
        RESOURCES_DIR = "src//main//resources//";
        OUTPUT_DIR = "src//main//resources//output//";
    }

    public void makeHTML() throws IOException, TemplateException, JRException {
        File file = ResourceUtils.getFile("classpath:jasper.jrxml");
        JasperReport jReport=JasperCompileManager.compileReport(file.getAbsolutePath());
        Map<String, Object> params = new HashMap<String, Object>();
        Document document = 
        JRXmlUtils.parse(JRLoader.getLocationInputStream(RESOURCES_DIR+"sample.xml"));
        params.put(JRXPathQueryExecuterFactory.PARAMETER_XML_DATA_DOCUMENT, document);
        params.put(JRXPathQueryExecuterFactory.XML_DATE_PATTERN, "yyyy-MM-dd");
        params.put(JRXPathQueryExecuterFactory.XML_NUMBER_PATTERN, "#,##0.##");
        params.put(JRXPathQueryExecuterFactory.XML_LOCALE, Locale.ENGLISH);
        params.put(JRParameter.REPORT_LOCALE, Locale.US);
        JasperPrint jPrint = JasperFillManager.fillReport(jReport, params);
        JasperExportManager.exportReportToPdfFile(jPrint,OUTPUT_DIR+"CustomersReport.pdf");
      }
}

错误

2020-02-28 14:39:44 [http-nio-9005-exec-2] DEBUG o.s.w.s.m.m.a.ExceptionHandlerExceptionResolver - Resolving exception from handler [public void com.imoveinvest.propertyuploader.controller.SaveOrValidateValuationReport.htmlCall() throws java.io.IOException,freemarker.template.TemplateException,net.sf.jasperreports.engine.JRException]: net.sf.jasperreports.engine.JRException: Error compiling report java source files: D:\SanjayS\ImoveHome\property-uploade-service\Blank_A4_1582880983002_121813.java .
2020-02-28 14:39:44 [http-nio-9005-exec-2] DEBUG o.s.w.s.m.a.ResponseStatusExceptionResolver - Resolving exception from handler [public void com.imoveinvest.propertyuploader.controller.SaveOrValidateValuationReport.htmlCall() throws java.io.IOException,freemarker.template.TemplateException,net.sf.jasperreports.engine.JRException]: net.sf.jasperreports.engine.JRException: Error compiling report java source files: D:\SanjayS\ImoveHome\property-uploade-service\Blank_A4_1582880983002_121813.java .
2020-02-28 14:39:44 [http-nio-9005-exec-2] DEBUG o.s.w.s.m.s.DefaultHandlerExceptionResolver - Resolving exception from handler [public void com.imoveinvest.propertyuploader.controller.SaveOrValidateValuationReport.htmlCall() throws java.io.IOException,freemarker.template.TemplateException,net.sf.jasperreports.engine.JRException]: net.sf.jasperreports.engine.JRException: Error compiling report java source files: D:\SanjayS\ImoveHome\property-uploade-service\Blank_A4_1582880983002_121813.java .
2020-02-28 14:39:44 [http-nio-9005-exec-2] DEBUG o.s.web.servlet.DispatcherServlet - Could not complete request
net.sf.jasperreports.engine.JRException: Error compiling report java source files: D:\SanjayS\ImoveHome\property-uploade-service\Blank_A4_1582880983002_121813.java .
    Caused by: java.io.IOException: Cannot run program "javac": CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessBuilder.start(Unknown Source)
    at java.lang.Runtime.exec(Unknown Source)
    at java.lang.Runtime.exec(Unknown Source)
    at net.sf.jasperreports.engine.design.JRJavacCompiler.compileClasses(JRJavacCompiler.java:63)
    ... 49 common frames omitted

I have been struggling a lot with this please help.

Answer 1

当您打开命令行 shell 并输入“javac”时会发生什么？是否失败并提示找不到程序“javac”？

看起来 jasper 报告正在生成 Java 代码，然后尝试编译它(javac 是 Java 编译器)，但它找不到编译器。这可能是因为它尚未安装，或者可能是它不在您的“路径”上。详细信息将取决于您使用的操作系统。但希望这能提供有关问题所在的线索并帮助您解决问题。

(实际上，仔细查看诊断结果会告诉我您使用的是 Windows，这意味着我无法提供比这更多的详细信息。)