Need to add slf4j dependency in Alternator pom.xml

[inder123]

I added Alternator per the instructions in your readme. However, when I attempt to start the Alternator server, I ran into an exception (see below). It seems to me that you need to specify an additional dependency in your pom.xml?

java.lang.NoSuchMethodError: org.slf4j.helpers.MessageFormatter.arrayFormat(Ljava/lang/String;[Ljava/lang/Object;)Lorg/slf4j/helpers/FormattingTuple;
at org.eclipse.jetty.util.log.JettyAwareLogger.log(JettyAwareLogger.java:613)
at org.eclipse.jetty.util.log.JettyAwareLogger.debug(JettyAwareLogger.java:200)
at org.eclipse.jetty.util.log.Slf4jLog.debug(Slf4jLog.java:84)
at org.eclipse.jetty.util.component.Container.add(Container.java:201)
at org.eclipse.jetty.util.component.Container.update(Container.java:164)
at org.eclipse.jetty.util.component.Container.update(Container.java:106)
at org.eclipse.jetty.server.Server.setConnectors(Server.java:183)
at org.eclipse.jetty.server.Server.addConnector(Server.java:157)
at com.michelboudreau.alternator.AlternatorDB.(AlternatorDB.java:41)
at com.michelboudreau.alternator.AlternatorDB.(AlternatorDB.java:24)
at com.trymph.user.server.persistence.DynamoDBMapperUserTest.setUp(DynamoDBMapperUserTest.java:27)
at junit.framework.TestCase.runBare(TestCase.java:128)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:120)
at junit.framework.TestSuite.runTest(TestSuite.java:230)
at junit.framework.TestSuite.run(TestSuite.java:225)
at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

[inder123]

These additional dependencies did the trick for me:

<dependency>
  <groupId>org.slf4j</groupId>
  <artifactId>slf4j-api</artifactId>
  <version>1.6.6</version>
</dependency>
<dependency>
  <groupId>org.slf4j</groupId>
  <artifactId>log4j-over-slf4j</artifactId>
  <version>1.6.6</version>
</dependency>

The issue is discussed in: http://stackoverflow.com/questions/7165633/exception-thrown-while-using-logback-slf4j

[mboudreau]

Are you having this problem in the alternator project itself or in the app running it?

[mboudreau]

Was missing the log4j-over-slf4j dependency in pom file. It was working in our application because dependency was already present. Fixed in 0.2.7-SNAPSHOT.

[inder123]

I had this problem in my project, not in Alternator.

[mboudreau]

Let me try it out in a new project to test it out.

[mboudreau]

Are you sure you incremented the version number to 0.2.7-SNAPSHOT? I just tried it on a new project which it started and stopped without issue.

[inder123]

yes, I tried it with 0.2.7-SNAPSHOT.
I am able to continue forward by adding those dependencies in my pom.xml as well, so it is not a blocker for me.
This was mainly FYI.
Thanks.

[mboudreau]

I can't reproduce this error at all, if you can provide me with a small project that creates the error, I can find out what's the cause.

[inder123]

I think the following two dependencies should be scoped to test instead of runtime or compile.
Only slf4j-api dependency should be set to compile.

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>log4j-over-slf4j</artifactId>
        <version>${slf4j.version}</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>1.0.0</version>
    </dependency>

Based on the guidelines in this doc:
http://veithen.blogspot.com/2009/10/taming-beast-managing-slf4j.html