python language server doesn't work

[philipp-lein]

Hello
python language server doesn't work. It is sending http request but e.g. hover doesn't return anything.
Is there any log where i can check why nothing returned?
Last time I try (before updating) this problem sometimes appear but I could fixed it with restart the python language server.

Reproduction Steps:
Started workspace from python stack
activate python language server
OS and version:
Mac OS 10.12.4
che 5.9.1

[STDOUT] 2017-05-02 12:15:21,387[nio-4401-exec-5]  [INFO ] [.c.a.l.r.ServerInitializerImpl 168]  - Initialized Language Server python on project /projects/First-Project
[STDERR] May 02, 2017 12:15:23 PM org.eclipse.lsp4j.jsonrpc.json.ConcurrentMessageProcessor run
[STDERR] SEVERE: java.lang.IllegalStateException: Expected STRING but was BEGIN_OBJECT
[STDERR] com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected STRING but was BEGIN_OBJECT
[STDERR] 	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:200)
[STDERR] 	at com.google.gson.Gson.fromJson(Gson.java:810)
[STDERR] 	at com.google.gson.Gson.fromJson(Gson.java:875)
[STDERR] 	at org.eclipse.lsp4j.jsonrpc.json.adapters.MessageTypeAdapterFactory$Adapter.createMessage(MessageTypeAdapterFactory.java:162)
[STDERR] 	at org.eclipse.lsp4j.jsonrpc.json.adapters.MessageTypeAdapterFactory$Adapter.read(MessageTypeAdapterFactory.java:130)
[STDERR] 	at org.eclipse.lsp4j.jsonrpc.json.adapters.MessageTypeAdapterFactory$Adapter.read(MessageTypeAdapterFactory.java:54)
[STDERR] 	at com.google.gson.Gson.fromJson(Gson.java:810)
[STDERR] 	at com.google.gson.Gson.fromJson(Gson.java:775)
[STDERR] 	at com.google.gson.Gson.fromJson(Gson.java:724)
[STDERR] 	at com.google.gson.Gson.fromJson(Gson.java:696)
[STDERR] 	at org.eclipse.lsp4j.jsonrpc.json.MessageJsonHandler.parseMessage(MessageJsonHandler.java:70)
[STDERR] 	at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.handleMessage(StreamMessageProducer.java:148)
[STDERR] 	at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.listen(StreamMessageProducer.java:77)
[STDERR] 	at org.eclipse.lsp4j.jsonrpc.json.ConcurrentMessageProcessor.run(ConcurrentMessageProcessor.java:68)
[STDERR] 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[STDERR] 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[STDERR] 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
[STDERR] 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
[STDERR] 	at java.lang.Thread.run(Thread.java:745)
[STDERR] Caused by: java.lang.IllegalStateException: Expected STRING but was BEGIN_OBJECT
[STDERR] 	at com.google.gson.internal.bind.JsonTreeReader.nextString(JsonTreeReader.java:154)
[STDERR] 	at com.google.gson.internal.bind.TypeAdapters$13.read(TypeAdapters.java:358)
[STDERR] 	at com.google.gson.internal.bind.TypeAdapters$13.read(TypeAdapters.java:346)
[STDERR] 	at org.eclipse.lsp4j.jsonrpc.json.adapters.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:78)
[STDERR] 	at org.eclipse.lsp4j.jsonrpc.json.adapters.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:54)
[STDERR] 	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:103)
[STDERR] 	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:196)
[STDERR] 	... 18 more

[philipp-lein]

Maybe there is a problem with the python language binary and its requirements with a tagged Jedi Version !

[ghost]

@phill1234 the problem with a wrong commit in requirements.txt has been fixed, but it does not look like it's what causes the error. Investigating. There's a similar issue in a Codenvy project codenvy/codenvy#2186

[davidwindell]

This happens on all our workspaces that only have the following agents;

"agents":[
    "org.eclipse.che.exec",
    "org.eclipse.che.terminal",
    "org.eclipse.che.ws-agent",
    "org.eclipse.che.ssh"
],