Update jar version and load bundle throw exception

[testforstephen]

reproduce steps:

1. Update the jar from 0.1.0-SNAPSHOT to 0.1.0, build new vsix
2. Uninstall old vsix from vscode
3. Install new vsix
4. From the logs, it throws exception:

[Error - 7:16:53 PM] Sep 25, 2017 7:16:53 PM Failed to load extension bundles 
Load bundle list
org.eclipse.core.runtime.CoreException: Load bundle list
	at org.eclipse.jdt.ls.core.internal.handlers.BundleUtils.loadBundles(BundleUtils.java:76)
	at org.eclipse.jdt.ls.core.internal.handlers.InitHandler.initialize(InitHandler.java:90)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.initialize(JDTLanguageServer.java:123)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.lambda$null$0(GenericEndpoint.java:51)
	at org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.request(GenericEndpoint.java:105)
	at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.handleRequest(RemoteEndpoint.java:210)
	at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.consume(RemoteEndpoint.java:146)
	at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.handleMessage(StreamMessageProducer.java:149)
	at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.listen(StreamMessageProducer.java:77)
	at org.eclipse.lsp4j.jsonrpc.json.ConcurrentMessageProcessor.run(ConcurrentMessageProcessor.java:84)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:748)
Contains: Install bundle failure C:\Users\jinbwan\.vscode-insiders\extensions\vscjava.vscode-java-debug-0.1.0\server\com.microsoft.java.debug.plugin-0.1.0-SNAPSHOT.jar
org.osgi.framework.BundleException: Error reading bundle content.
	at org.eclipse.osgi.storage.Storage.install(Storage.java:501)
	at org.eclipse.osgi.internal.framework.BundleContextImpl.installBundle(BundleContextImpl.java:146)
	at org.eclipse.osgi.internal.framework.BundleContextImpl.installBundle(BundleContextImpl.java:139)
	at org.eclipse.jdt.ls.core.internal.handlers.BundleUtils.loadBundles(BundleUtils.java:65)
	at org.eclipse.jdt.ls.core.internal.handlers.InitHandler.initialize(InitHandler.java:90)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.initialize(JDTLanguageServer.java:123)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.lambda$null$0(GenericEndpoint.java:51)
	at org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.request(GenericEndpoint.java:105)
	at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.handleRequest(RemoteEndpoint.java:210)
	at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.consume(RemoteEndpoint.java:146)
	at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.handleMessage(StreamMessageProducer.java:149)
	at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.listen(StreamMessageProducer.java:77)
	at org.eclipse.lsp4j.jsonrpc.json.ConcurrentMessageProcessor.run(ConcurrentMessageProcessor.java:84)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.FileNotFoundException: C:\Users\jinbwan\.vscode-insiders\extensions\vscjava.vscode-java-debug-0.1.0\server\com.microsoft.java.debug.plugin-0.1.0-SNAPSHOT.jar
	at org.eclipse.osgi.storage.url.reference.ReferenceURLConnection.checkRead(ReferenceURLConnection.java:59)
	at org.eclipse.osgi.storage.url.reference.ReferenceURLConnection.connect(ReferenceURLConnection.java:51)
	at org.eclipse.osgi.storage.url.reference.ReferenceURLConnection.getInputStream(ReferenceURLConnection.java:93)
	at org.eclipse.osgi.storage.Storage.install(Storage.java:499)
	... 21 more

[akaroml]

We'll need to fix this in https://github.com/Microsoft/vscode-java-debug/milestone/2

microsoft/vscode#35006 opened for vscode to consider notifying the extension before uninstalling.

Another option is to make change at jdt.ls side to fail gracefully when a bundle is missing. At debugger side, we do an upgrade whenever a new version is installed.

[yaohaizh]

This happens in two situations on the Windows platform:

1. When uninstall the extension, the JDT language server and debug server are in running.
2. After installed the VSIX, the issue will disappear after the first time exception.