如何修复:DOCX到HTML的DOCX4J错误(java.lang.NullPointerException)

Question

我正在尝试使用DOCX4j、Java 11、Spring boot 2.3.5、Ubuntu 18.04.5将DOCX转换为HTML，并且我正在tomcat 9上运行我的.WAR文件。

当我运行代码时，我会得到这个错误。我该怎么解决这个问题？

我的代码

参考：

1. 使用Docx4j 将HTML导出到DOCX

2. https://github.com/plutext/docx4j-ImportXHTML/blob/master/src/samples/java/org/docx4j/samples/DocxToXhtmlAndBack.java

   WordprocessingMLPackage wordMLPackage = WordprocessingMLPackage.load(new File(source));
   HTMLSettings htmlSettings = Docx4J.createHTMLSettings();
   htmlSettings.setWmlPackage(wordMLPackage);
   htmlSettings.setImageDirPath("temp_images");
   htmlSettings.setImageTargetUri("temp_images");
   htmlSettings.setImageIncludeUUID(false);
   boolean nestLists = false;
   if (nestLists) {
   SdtWriter.registerTagHandler("HTML_ELEMENT", new SdtToListSdtTagHandler());
   } else {
   // convert numberings to plain text
   htmlSettings.getFeatures().remove(ConversionFeatures.PP_HTML_COLLECT_LISTS);
   } 
   OutputStream os = new java.io.FileOutputStream(dest);
   Docx4J.toHTML(htmlSettings, os, Docx4J.FLAG_EXPORT_PREFER_XSL);
   

Pom.xml：

<dependency>
<groupId>org.docx4j</groupId>
<artifactId>docx4j</artifactId>
<version>6.1.2</version>
</dependency>
<dependency>
<groupId>org.docx4j</groupId>
<artifactId>docx4j-JAXB-ReferenceImpl</artifactId>
<version>11.2.5</version>
</dependency> 
<dependency>
<groupId>org.docx4j</groupId>
<artifactId>docx4j-MOXy-JAXBContext</artifactId>
<version>6.0.0</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.moxy</artifactId>
<version>2.7.7</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>2.7.7</version>
</dependency>
<dependency>
<groupId>fr.opensagres.xdocreport</groupId>
<artifactId>fr.opensagres.xdocreport.document.docx</artifactId>
<version>2.0.2</version>
</dependency>
<dependency>
<groupId>fr.opensagres.xdocreport</groupId>
<artifactId>fr.opensagres.xdocreport.template.freemarker</artifactId>
<version>2.0.2</version>
</dependency>
<dependency>
<groupId>fr.opensagres.xdocreport</groupId>
<artifactId>fr.opensagres.xdocreport.converter.docx.xwpf</artifactId>
<version>2.0.2</version>
</dependency>

日志文件：

org.docx4j.openpackaging.exceptions.Docx4JException: Exception exporting package
org.docx4j.openpackaging.exceptions.Docx4JException: Exception exporting package
at org.docx4j.convert.out.common.AbstractExporter.export(AbstractExporter.java:106)
at org.docx4j.Docx4J.toHTML(Docx4J.java:830)
at com.home.converter.Xhtmlconv.startConveter(Xhtmlconv.java:141)
at com.home.controller.myproject.shephard.GetController.getStartGenerateXhtml(GetController.java:1377)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:126)
at org.springframework.boot.web.servlet.support.ErrorPageFilter.access$000(ErrorPageFilter.java:64)
at org.springframework.boot.web.servlet.support.ErrorPageFilter$1.doFilterInternal(ErrorPageFilter.java:101)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.NullPointerException
at org.docx4j.openpackaging.parts.WordprocessingML.ObfuscatedFontPart.deleteEmbeddedFontTempFiles(ObfuscatedFontPart.java:263)
at org.docx4j.openpackaging.parts.WordprocessingML.FontTablePart.deleteEmbeddedFontTempFiles(FontTablePart.java:161)
at org.docx4j.convert.out.common.AbstractExporter.export(AbstractExporter.java:90)
... 61 more

编辑：我试着在tomcat 9、Windows 10上运行同样的WAR，一切都正常。有趣的但是我如何在linux tomcat上解决这个问题呢？(检查了tomcat/linux，它们还可以，没有损坏(

Answer 1

看起来您的tmpFontDir为null。

https://github.com/plutext/docx4j/blob/master/docx4j-core/src/main/java/org/docx4j/openpackaging/parts/AbstractFontPart.java#L66

考虑设置属性docx4j.openpackaging.parts.WordprocessingML.ObfuscatedFontPart.tmpFontDir

由于您使用的是Tomcat，请将其设置为Tomcat_HOME/temp(替换其中的实际路径(。