[使用XWPFDocument打开docx文件时出现NullPointerException

Question

从Java打开Microsoft Word docx文件时，我得到了NullPointerException。这是我的代码：

public class MainClass {
    public static void main(String[] args) {
        try {
            File file = new File("C:\\DevProjects\\Word\\test1.docx");
            FileInputStream fis = new FileInputStream(file);
            XWPFDocument document = new XWPFDocument(fis) ;
        }catch(Exception e) {  
            System.out.println(e.getMessage());  
        }  
    }
}

这是堆栈跟踪：

Exception in thread "main" java.lang.ExceptionInInitializerError
    at sun.misc.Unsafe.ensureClassInitialized(Native Method)
    at sun.reflect.UnsafeFieldAccessorFactory.newFieldAccessor(UnsafeFieldAccessorFactory.java:43)
    at sun.reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:156)
    at java.lang.reflect.Field.acquireFieldAccessor(Field.java:1088)
    at java.lang.reflect.Field.getFieldAccessor(Field.java:1069)
    at java.lang.reflect.Field.get(Field.java:393)
    at org.apache.xmlbeans.XmlBeans.typeSystemForClassLoader(XmlBeans.java:775)
    at org.openxmlformats.schemas.wordprocessingml.x2006.main.DocumentDocument.<clinit>(Unknown Source)
    at org.openxmlformats.schemas.wordprocessingml.x2006.main.DocumentDocument$Factory.parse(Unknown Source)
    at org.apache.poi.xwpf.usermodel.XWPFDocument.onDocumentRead(XWPFDocument.java:180)
    at org.apache.poi.ooxml.POIXMLDocument.load(POIXMLDocument.java:184)
    at org.apache.poi.xwpf.usermodel.XWPFDocument.<init>(XWPFDocument.java:145)
    at com.word.MainClass.main(MainClass.java:21)
Caused by: java.lang.RuntimeException: Could not instantiate SchemaTypeSystemImpl (java.lang.reflect.InvocationTargetException): is the version of xbean.jar correct?
    at schemaorg_apache_xmlbeans.system.sD023D6490046BA0250A839A9AD24C443.TypeSystemHolder.loadTypeSystem(Unknown Source)
    at schemaorg_apache_xmlbeans.system.sD023D6490046BA0250A839A9AD24C443.TypeSystemHolder.<clinit>(Unknown Source)
    ... 13 more
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    ... 15 more
Caused by: java.lang.NullPointerException
    at org.apache.xmlbeans.impl.schema.ClassLoaderResourceLoader.getResourceAsStream(ClassLoaderResourceLoader.java:33)
    at org.apache.xmlbeans.impl.schema.SchemaTypeSystemImpl$XsbReader.getLoaderStream(SchemaTypeSystemImpl.java:2249)
    at org.apache.xmlbeans.impl.schema.SchemaTypeSystemImpl$XsbReader.<init>(SchemaTypeSystemImpl.java:1522)
    at org.apache.xmlbeans.impl.schema.SchemaTypeSystemImpl.initFromHeader(SchemaTypeSystemImpl.java:273)
    at org.apache.xmlbeans.impl.schema.SchemaTypeSystemImpl.<init>(SchemaTypeSystemImpl.java:185)
    ... 19 more

我将以下JAR（来自poi-bin-4.1.2-20200217）包括到我的项目中：List of JARs in the project

我在做什么错？

Answer 1

我设法使用XWPFDocument类打开Word文档。这也回答了此处发布的问题：Apache POI XSSFWorkbook throwing NullPointerException for file这是我的做法：1.我直接将罐子添加到项目中，请参阅项目层次结构Eclipse project structure2.我将罐子添加到Java Build Path中，请参见此处：Java Build Path现在打开文档。