[HBASE-11875] Referencing external package com/google/protobuf/ inside hbase-protcol module won't work in OSGI environment

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Incomplete
• Affects Version/s: 0.98.6
• Component/s: Protobufs

Environment

OSGI container

• Assignee: Unassigned
• Reporter: ayache khettar
• Created: 01/Sep/14 16:49
• Updated: 17/Jun/22 17:23
• Resolved: 11/Jun/22 20:56

Description

Hi

HbaseZeroCopyByteString class isn't accessible in OSGI based environment. The reason is that it ends up in a separate route package within an OSGI bundle. As such the class isn't viewable by the classLoader.

I understand that the hbase-module isn't an osgi bundle, but there is another project which makes use of this module to generate an osgi bundle for the OSGI container: https://github.com/apache/servicemix4-bundles/tree/trunk/hbase-0.98.0-hadoop2. If you get hold of the binary or source artefact from maven, unzip the jar and you will see the structure of the project:
com/google/ (classes defined in this package are not visible by the classLoader).
org/apache/hbase

I understand the reason of having a foreign package, because LiteralByteString is package protected. It would be nice to work out another way of extending google protobuf classes. I would recommend going for composition as opposed to inheritance that will solve the problem.

Regards,

Ayache

Caused by: java.lang.NoClassDefFoundError: com/google/protobuf/HBaseZeroCopyByteString
at org.apache.hadoop.hbase.protobuf.RequestConverter.buildRegionSpecifier(RequestConverter.java:908)[252:org.apache.servicemix.bundles.hbase:0.98.0.hadoop2-inps]
at org.apache.hadoop.hbase.protobuf.RequestConverter.buildGetRowOrBeforeRequest(RequestConverter.java:132)[252:org.apache.servicemix.bundles.hbase:0.98.0.hadoop2-inps]
at org.apache.hadoop.hbase.protobuf.ProtobufUtil.getRowOrBefore(ProtobufUtil.java:1466)[252:org.apache.servicemix.bundles.hbase:0.98.0.hadoop2-inps]
at org.apache.hadoop.hbase.client.HTable$2.call(HTable.java:701)[252:org.apache.servicemix.bundles.hbase:0.98.0.hadoop2-inps]
at org.apache.hadoop.hbase.client.HTable$2.call(HTable.java:699)[252:org.apache.servicemix.bundles.hbase:0.98.0.hadoop2-inps]
at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:121)[252:org.apache.servicemix.bundles.hbase:0.98.0.hadoop2-inps]
... 56 more