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fix java.lang.NullPointerException bug (microsoft#74)
* fix java.lang.NullPointerException bug [Error - 3:28:50 PM] Oct 12, 2017 3:27:33 PM Problems occurred when invoking code from plug-in: "org.eclipse.jdt.ls.core". null java.lang.NullPointerException at com.microsoft.java.debug.core.UsageDataSession.getSessionGuid(UsageDataSession.java:45) at com.microsoft.java.debug.core.UsageDataStore.logErrorData(UsageDataStore.java:84) at com.microsoft.java.debug.plugin.internal.UsageDataLogHandler.publish(UsageDataLogHandler.java:34) at java.util.logging.Logger.log(Logger.java:738) at java.util.logging.Logger.doLog(Logger.java:765) at java.util.logging.Logger.log(Logger.java:876) at com.microsoft.java.debug.plugin.internal.ResolveClasspathsHandler.resolveClasspaths(ResolveClasspathsHandler.java:52) at com.microsoft.java.debug.plugin.internal.JavaDebugDelegateCommandHandler.executeCommand(JavaDebugDelegateCommandHandler.java:42) at org.eclipse.jdt.ls.core.internal.handlers.WorkspaceExecuteCommandHandler$1.run(WorkspaceExecuteCommandHandler.java:133) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.jdt.ls.core.internal.handlers.WorkspaceExecuteCommandHandler.executeCommand(WorkspaceExecuteCommandHandler.java:128) at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$2(JDTLanguageServer.java:250) at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602) * Update UsageDataSession.java
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com.microsoft.java.debug.core/src/main/java/com/microsoft/java/debug/core/UsageDataSession.java

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@@ -42,7 +42,7 @@ public class UsageDataSession {
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private List<String> eventList = new ArrayList<>();
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public static String getSessionGuid() {
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return threadLocal.get().sessionGuid;
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return threadLocal.get() == null ? "" : threadLocal.get().sessionGuid;
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}
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public UsageDataSession() {

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