无法使用Apache POI 3.14读取XLSX文件

Question

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

我正在使用以下命令读取文件：

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工件，例如：stax-api和stax。但所有的解决办法似乎都不奏效。

Answer 1

问题似乎是有两个包导出包javax.xml.stream。看起来org.apache.xerces.stax.XMLEventFactoryImpl连接到这些包中的一个，而您的bundle连接到另一个。因此即使它们的名称相同,它们也不会看到相同的类。

要避免这种情况，请确保只有一个包导出此包。实现这一点的一种方法是从系统包导出包，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