Java 读取excel文件时出现奇怪的OSGI错误

我在我非常简单的Spring项目中遇到了一个错误。这个项目的目标非常简单：它是一个restful服务，它使用ApachePOI连接到一个excel文件，读取单元格中的一些值并返回它，所以当我转到localhost时，我可以在web浏览器中看到它 输出如下：Hello world，Excel值为：5

我调试了很多次代码，我确信这个错误来自“工作表”行

以下是错误消息：

initialized with Attributes:{applicationName=BasicService, bundleName=Basic-Serv
ice}
ERROR: Bundle dsp.core [237] EventDispatcher: Error during dispatch. (java.lang.
NullPointerException)
java.lang.NullPointerException
        at com.ge.dsp.core.spi.impl.ServiceManagerServiceImpl.addRegisteredServi
ce(ServiceManagerServiceImpl.java:876)
        at com.ge.dsp.core.spi.impl.ServiceManagerServiceImpl.addRegisteredServi
ce(ServiceManagerServiceImpl.java:856)
        at com.ge.dsp.core.bootloader.impl.CoreServiceListener.serviceChanged(Co
reServiceListener.java:79)
        at org.apache.felix.framework.util.EventDispatcher$4.run(EventDispatcher
.java:925)
        at java.security.AccessController.doPrivileged(Native Method)
        at org.apache.felix.framework.util.EventDispatcher.invokeServiceListener
Callback(EventDispatcher.java:921)
        at org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(
EventDispatcher.java:793)
        at org.apache.felix.framework.util.EventDispatcher.fireServiceEvent(Even
tDispatcher.java:543)
        at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4260)
        at org.apache.felix.framework.Felix.registerService(Felix.java:3275)
        at org.apache.felix.framework.BundleContextImpl.registerService(BundleCo
ntextImpl.java:346)
        at org.apache.aries.blueprint.container.BlueprintContainerImpl$3.run(Blu
eprintContainerImpl.java:443)
        at org.apache.aries.blueprint.container.BlueprintContainerImpl$3.run(Blu
eprintContainerImpl.java:441)
        at java.security.AccessController.doPrivileged(Native Method)
        at org.apache.aries.blueprint.container.BlueprintContainerImpl.registerS
ervice(BlueprintContainerImpl.java:441)
        at org.apache.aries.blueprint.container.ServiceRecipe.register(ServiceRe
cipe.java:190)
        at org.apache.aries.blueprint.container.BlueprintContainerImpl.registerS
ervices(BlueprintContainerImpl.java:690)
        at org.apache.aries.blueprint.container.BlueprintContainerImpl.doRun(Blu
eprintContainerImpl.java:369)
        at org.apache.aries.blueprint.container.BlueprintContainerImpl.run(Bluep
rintContainerImpl.java:261)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:47
1)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at org.apache.aries.blueprint.container.ExecutorServiceWrapper.run(Execu
torServiceWrapper.java:106)
        at org.apache.aries.blueprint.utils.threading.impl.DiscardableRunnable.r
un(DiscardableRunnable.java:48)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:47
1)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.
access$201(ScheduledThreadPoolExecutor.java:178)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.
run(ScheduledThreadPoolExecutor.java:292)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.
java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
.java:615)
        at java.lang.Thread.run(Thread.java:744)

---

很高兴知道什么是联机ServiceManagerServiceImpl.java：876@BalazsZsoldos它返回如下内容：int result=version.getMajor（）-other.getMajor（）；如果（result！=0）{returnresult；}下一个问题是：以下变量来自哪里：version、other、result？您知道，如果没有源代码（以及stacktrace中类的源代码），很难找出NPE的原因。ApachePOI不提供OSGi捆绑包作为标准。你从哪里得到的？

NullPointerException

不是OSGi错误，它是任何包含bug的Java代码中都可能发生的错误。如果你不发布你的代码，这里就没有办法帮你。我知道您为GE工作，所以可能无法发布代码。在这种情况下，您应该向GE的同事寻求帮助。

initialized with Attributes:{applicationName=BasicService, bundleName=Basic-Serv
ice}
ERROR: Bundle dsp.core [237] EventDispatcher: Error during dispatch. (java.lang.
NullPointerException)
java.lang.NullPointerException
        at com.ge.dsp.core.spi.impl.ServiceManagerServiceImpl.addRegisteredServi
ce(ServiceManagerServiceImpl.java:876)
        at com.ge.dsp.core.spi.impl.ServiceManagerServiceImpl.addRegisteredServi
ce(ServiceManagerServiceImpl.java:856)
        at com.ge.dsp.core.bootloader.impl.CoreServiceListener.serviceChanged(Co
reServiceListener.java:79)
        at org.apache.felix.framework.util.EventDispatcher$4.run(EventDispatcher
.java:925)
        at java.security.AccessController.doPrivileged(Native Method)
        at org.apache.felix.framework.util.EventDispatcher.invokeServiceListener
Callback(EventDispatcher.java:921)
        at org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(
EventDispatcher.java:793)
        at org.apache.felix.framework.util.EventDispatcher.fireServiceEvent(Even
tDispatcher.java:543)
        at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4260)
        at org.apache.felix.framework.Felix.registerService(Felix.java:3275)
        at org.apache.felix.framework.BundleContextImpl.registerService(BundleCo
ntextImpl.java:346)
        at org.apache.aries.blueprint.container.BlueprintContainerImpl$3.run(Blu
eprintContainerImpl.java:443)
        at org.apache.aries.blueprint.container.BlueprintContainerImpl$3.run(Blu
eprintContainerImpl.java:441)
        at java.security.AccessController.doPrivileged(Native Method)
        at org.apache.aries.blueprint.container.BlueprintContainerImpl.registerS
ervice(BlueprintContainerImpl.java:441)
        at org.apache.aries.blueprint.container.ServiceRecipe.register(ServiceRe
cipe.java:190)
        at org.apache.aries.blueprint.container.BlueprintContainerImpl.registerS
ervices(BlueprintContainerImpl.java:690)
        at org.apache.aries.blueprint.container.BlueprintContainerImpl.doRun(Blu
eprintContainerImpl.java:369)
        at org.apache.aries.blueprint.container.BlueprintContainerImpl.run(Bluep
rintContainerImpl.java:261)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:47
1)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at org.apache.aries.blueprint.container.ExecutorServiceWrapper.run(Execu
torServiceWrapper.java:106)
        at org.apache.aries.blueprint.utils.threading.impl.DiscardableRunnable.r
un(DiscardableRunnable.java:48)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:47
1)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.
access$201(ScheduledThreadPoolExecutor.java:178)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.
run(ScheduledThreadPoolExecutor.java:292)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.
java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
.java:615)
        at java.lang.Thread.run(Thread.java:744)