java - 无法使用 Apache POI 3.14 读取 XLSX 文件

Question

我能够在基于 OSGI 的应用程序中正确读取 XLS 文件，但是当我尝试读取 XLSX 文件时，出现以下错误。

Caused by: java.lang.ExceptionInInitializerError
    at org.apache.poi.openxml4j.opc.OPCPackage.init(OPCPackage.java:162)
    at org.apache.poi.openxml4j.opc.OPCPackage.<init>(OPCPackage.java:142)
    at org.apache.poi.openxml4j.opc.Package.<init>(Package.java:37)
    at org.apache.poi.openxml4j.opc.ZipPackage.<init>(ZipPackage.java:128)
    at org.apache.poi.openxml4j.opc.OPCPackage.open(OPCPackage.java:257)
    at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:291)[242:export_poi.jar:0.0.0]
    at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:252)[242:export_poi.jar:0.0.0]
    at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:231)[242:export_poi.jar:0.0.0]
    at mycom.project2.ExcelAdapter.Sources.Source.readExcelFile(Source.java:67)[232:ExcelAdapter:1.0.0]
    at mycom.project2.ExcelAdapter.Sources.Source.<init>(Source.java:56)[232:ExcelAdapter:1.0.0]
    at mycom.project2.ExcelAdapter.Sources.SourcesManager.addSource(SourcesManager.java:55)[232:ExcelAdapter:1.0.0]
    at mycom.project2.ExcelAdapter.Sources.SourcesManager.addSources(SourcesManager.java:48)[232:ExcelAdapter:1.0.0]
    at mycom.project2.ExcelAdapter.Processors.Engine.setResourceConfig(Engine.java:44)[232:ExcelAdapter:1.0.0]
    at mycom.project2.ExcelAdapter.ExcelAdapter.configureBusinessLogic(ExcelAdapter.java:164)[232:ExcelAdapter:1.0.0]
    at mycom.project1.function_engine_tooling.fb.libraries.FunctionBlockType.addFunctionBlockInstance(FunctionBlockType.java:161)[234:fb-libraries:1.0.0]
    at mycom.project1.function_engine_tooling.fb.libraries.FunctionBlockType.handleCreateFbInstances(FunctionBlockType.java:373)[234:fb-libraries:1.0.0]
    at mycom.project1.function_engine_tooling.fb.libraries.FunctionBlockType.onMessageReceived(FunctionBlockType.java:197)[234:fb-libraries:1.0.0]
    at mycom.project2.ExcelAdapter.ExcelAdapterInstanceFactory.onMessageReceived(ExcelAdapterInstanceFactory.java:46)[232:ExcelAdapter:1.0.0]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[:1.8.0_131]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)[:1.8.0_131]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.8.0_131]
    at java.lang.reflect.Method.invoke(Method.java:498)[:1.8.0_131]
    at org.apache.camel.component.bean.MethodInfo.invoke(MethodInfo.java:408)
    at org.apache.camel.component.bean.MethodInfo$1.doProceed(MethodInfo.java:279)
    at org.apache.camel.component.bean.MethodInfo$1.proceed(MethodInfo.java:252)
    ... 19 more
Caused by: java.lang.ClassCastException: org.apache.xerces.stax.XMLEventFactoryImpl cannot be cast to javax.xml.stream.XMLEventFactory

我正在使用这个命令来读取文件:

WorkbookFactory.create(new File("fileName"));  

我在网上尝试了各种解决方案，它们告诉我要排除某些 artifactID，例如:stax-api 和 stax。但似乎没有一种解决方案有效。

Answer 1

问题似乎是有两个包导出包 javax.xml.stream。似乎 org.apache.xerces.stax.XMLEventFactoryImpl 连接到这些包之一，而您的包连接到另一个包。因此，即使它们被命名为相同的类，它们也看不到相同的类。

为避免这种情况，请确保只有一个包导出该包。实现这一目标的一种方法是 export the package from the system bundle因为它应该存在于 jre 中。

至少对于 apache karaf，安装很简单。使用这些包:

install -s mvn:commons-codec/commons-codec/1.10
install -s mvn:org.apache.commons/commons-collections4/4.1
install -s mvn:org.apache.servicemix.bundles/org.apache.servicemix.bundles.poi/3.16_1