使用XWPFDocument打开docx文件时的NullPointerException[duplicate]

Question

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());  
        }  
    }
}

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

我做错了什么？

Answer 1

我设法使用XWPFDocument类打开了Word文档。这也回答了这里发布的问题：Apache POI XSSFWorkbook为文件抛出NullPointerException。下面是我是怎么做的：

1. 我将JAR直接添加到项目中-请参见项目层次结构-Eclipse项目结构
2. 我将JAR添加到Java构建路径中-请参见这里的Java构建路径

我在Java8和JDK11中测试了这一点，它们都可以工作。