Viacheslav Dobromyslov created GORA-372:
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Summary: slf4j-api version conflict
Key: GORA-372
URL: https://issues.apache.org/jira/browse/GORA-372
Project: Apache Gora
Issue Type: Bug
Components: gora-hbase
Affects Versions: 0.6
Environment: Gentoo Linux, Oracle JDK 1.7.0.51-r1
Reporter: Viacheslav Dobromyslov
Created project with the following dependencies:
{code}
<dependencies>
<dependency>
<groupId>org.apache.gora</groupId>
<artifactId>gora-core</artifactId>
<version>0.6-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.apache.gora</groupId>
<artifactId>gora-hbase</artifactId>
<version>0.6-SNAPSHOT</version>
</dependency>
</dependencies>
{code}
Snapshot version:
https://github.com/apache/gora/tree/a72c5d36033fa393e492c047cb818b318edd2b35
And got a critical runtime error described below.
{code}
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in
[jar:file:/home/bbg/.m2/repository/org/slf4j/slf4j-log4j12/1.4.3/slf4j-log4j12-1.4.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in
[jar:file:/home/bbg/.m2/repository/org/slf4j/slf4j-simple/1.6.6/slf4j-simple-1.6.6.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: slf4j-api 1.6.x (or later) is incompatible with this binding.
SLF4J: Your binding is version 1.5.5 or earlier.
SLF4J: Upgrade your binding to version 1.6.x.
{code}
Stack trace:
{code}
Exception in thread "main" java.lang.NoSuchMethodError:
org.slf4j.impl.StaticLoggerBinder.getSingleton()Lorg/slf4j/impl/StaticLoggerBinder;
at org.slf4j.LoggerFactory.bind(LoggerFactory.java:128)
at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:107)
at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:295)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:269)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:281)
at org.apache.gora.tutorial.log.LogManager.<clinit>(LogManager.java:24)
{code}
The error is caused by slf4j-api version conflict:
# gora-hbase depends on org.apache.hbase:hbase-0.94.14
# hbase-0.94.14 depends on org.slf4j:slf4j-log4j12 which causes the conflict.
We have to exclude this old dependency to sort the issue out.
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