我试图在IBM Websphere Liberty（版本17.0.0.1）上启动和应用。
server.xml中：
...
<featureManager>
<feature>appSecurity-2.0</feature>
<feature>concurrent-1.0</feature>
<feature>ejbLite-3.1</feature>
<feature>jndi-1.0</feature>
<feature>jpa-2.0</feature>
<feature>jsp-2.2</feature>
<feature>localConnector-1.0</feature>
</featureManager>
...
<application id=<id> location=<location> name=<name> type="ear">
<classloader apiTypeVisibility="spec,ibm-api,api,third-party" delegation="parentLast" />
</application>
...
来自控制台日志的最后一行：
[INFO ] CNTR4001I: The <ejbModule>.jar EJB module in the <ear> application has started successfully.
[INFO ] SRVE0169I: Loading Web Module: <webModule>.jar
[INFO ] SRVE0250I: Web Module <webModule> has been bound to default_host.
[AUDIT ] CWWKT0016I: Web application available (default_host): http://<hostname>:9080/<contextRoot>/
[AUDIT ] CWWKZ0001I: Application <ear> started in 14.240 seconds.
[INFO ] FFDC1015I: An FFDC Incident has been created: "java.lang.NullPointerException com.ibm.ws.webcontainer.osgi.DynamicVirtualHost startWebApp" at ffdc_18.03.28_16.26.36.0.log
[INFO ] SRVE9103I: A configuration file for a web server plugin was automatically generated for this server at <Liberty installation dir>\usr\servers\<serverName>\logs\state\plugin-cfg.xml.
FFDC
------Start of DE processing------ = [3/28/18 16:26:36:634 EEST]
Exception = java.lang.NullPointerException
Source = com.ibm.ws.webcontainer.osgi.DynamicVirtualHost
probeid = startWebApp
Stack Dump = java.lang.NullPointerException
at java.util.TreeMap.put(TreeMap.java:568)
at java.util.TreeSet.add(TreeSet.java:267)
at java.util.AbstractCollection.addAll(AbstractCollection.java:354)
at java.util.TreeSet.addAll(TreeSet.java:324)
at com.ibm.ws.webcontainer.osgi.webapp.WebApp.getInjectionClasses(WebApp.java:324)
at com.ibm.ws.webcontainer.osgi.webapp.WebApp.getComponentNameSpaceConfiguration(WebApp.java:288)
at com.ibm.ws.injectionengine.ReferenceContextImpl.processImpl(ReferenceContextImpl.java:347)
at com.ibm.ws.injectionengine.ReferenceContextImpl.process(ReferenceContextImpl.java:305)
at com.ibm.ws.injectionengine.osgi.internal.OSGiReferenceContextImpl.process(OSGiReferenceContextImpl.java:31)
at com.ibm.ws.webcontainer.osgi.webapp.WebApp.commonInitializationStart(WebApp.java:254)
at com.ibm.ws.webcontainer.webapp.WebApp.initialize(WebApp.java:1038)
at com.ibm.ws.webcontainer.webapp.WebApp.initialize(WebApp.java:6565)
at com.ibm.ws.webcontainer.osgi.DynamicVirtualHost.startWebApp(DynamicVirtualHost.java:468)
at com.ibm.ws.webcontainer.osgi.DynamicVirtualHost.startWebApplication(DynamicVirtualHost.java:463)
at com.ibm.ws.webcontainer.osgi.WebContainer.startWebApplication(WebContainer.java:1051)
at com.ibm.ws.webcontainer.osgi.WebContainer.access$000(WebContainer.java:104)
at com.ibm.ws.webcontainer.osgi.WebContainer$2.run(WebContainer.java:870)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:483)
at java.util.concurrent.FutureTask.run(FutureTask.java:274)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1157)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:627)
at java.lang.Thread.run(Thread.java:809)
从我的角度来看，FFDC日志对原因并不十分了解，但是使用-verbose：class我可以看到生成异常之前加载的最后一个类是jsp相关的。我没有想法。