Connect to Cloud Bigtable from Google App Engine

问题

It appears that I cannot create a connection from Java class running on AppEngine.

I use the following library/dependency:

<dependency>
   <groupId>com.google.cloud.bigtable</groupId>
   <artifactId>bigtable-hbase-1.1</artifactId>
   <version>0.1.9</version>
</dependency>

And the following lines of code:

import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.*;
Configuration conf = HBaseConfiguration.create();
connection  = ConnectionFactory.createConnection(conf);

It appears that the ConnectionFactory.createConnection() method tries to use a restricted class.

Could you help us in explaining how we can use this on GAE?

I get the following error when running locally on devserver:

 Caused by: java.lang.NoClassDefFoundError: java.lang.management.ManagementFactory is a restricted class. Please see the Google  App Engine developer's guide for more details.
    at     com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:52)
        at org.apache.hadoop.util.ReflectionUtils.<clinit>(ReflectionUtils.java:137)
        at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:191)
    at com.google.appengine.tools.development.agent.runtime.RuntimeHelper.checkRestricted(RuntimeHelper.java:70)
    at com.google.appengine.tools.development.agent.runtime.Runtime.checkRestricted(Runtime.java:65)
    at org.apache.hadoop.hbase.security.UserProvider.instantiate(UserProvider.java:45)
    at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:214)
    at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:119)
    at org.energyworx.datastore.BigTableTSStorage.<init>(BigTableTSStorage.java:104)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at java.lang.Class.newInstance(Class.java:379)
    at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:373)
    ... 71 more

回答1:

I've updated the sample on GitHub.

来源：https://stackoverflow.com/questions/31101156/connect-to-cloud-bigtable-from-google-app-engine

标签

google-app-engine

google-cloud-bigtable