Develop Reference

Maven dependency weird bug

I have 4 projects in my eclipse workspace. They are all 4 maven projects. The names are API, Games, Faction, Board.
API is used in all the other maven projects (Games, Faction, Board) and itself depends of a jar into my PC and also HikariCP.
I declare this dependencies in my API pom.xml
<dependency>
<groupId>org.github.paperspigot</groupId>
<artifactId>paperspigot-api</artifactId>
<version>1.7.10-R0.1-SNAPSHOT</version>
<scope>system</scope>
<systemPath>${basedir}\lib\paperspigot-1.7.10-R0.1-SNAPSHOT.jar</systemPath>
</dependency>
<dependency>
<groupId>com.zaxxer</groupId>
<artifactId>HikariCP</artifactId>
<version>2.7.8</version>
<scope>compile</scope>
</dependency>
Then I declare on my 3 other projects that they depend of API
<dependency>
<groupId>net.onima</groupId>
<artifactId>onimaapi</artifactId>
<version>0.0.1-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
But I have a big warning on the API and the error log says this:
I don't understand why is there this error as I can code with the API in my classes. Can someone explain me? Thanks
EDIT: As requested the text of the screenshot:
Description Resource Path Location Type
Project 'OnimaAPI' is missing required Java project: 'paperspigot' OnimaAPI Build path Build Path Problem
Description Resource Path Location Type
Project 'OnimaGames' is missing required Java project: 'onimaapi' OnimaGames Build path Build Path Problem
I don't know why I can't set the pom.xml here so here's a link: https://ghostbin.com/paste/r4u62

You're declaring paperspigot with system scope.
<dependency>
<groupId>org.github.paperspigot</groupId>
<artifactId>paperspigot-api</artifactId>
<version>1.7.10-R0.1-SNAPSHOT</version>
<scope>system</scope>
<systemPath>${basedir}\lib\paperspigot-1.7.10-R0.1-SNAPSHOT.jar</systemPath>
</dependency>
Dependencies with the scope system are always available and are not looked up in repository. They are usually used to tell Maven about dependencies which are provided by the JDK or the VM.
https://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html#System_Dependencies
You should declare it with compile scope:
This is the default scope, used if none is specified. Compile dependencies are available in all classpaths of a project. Furthermore, those dependencies are propagated to dependent projects.

log4j and log4j-overslf4j both in classpath conflicts in LogManager

we are using log4j-over-slf4j for logging in our application. But one of jar dependency in our application(External to us) needs log4j specific class(org.apache.log4j.spi.RepositorySelector). So, I have added log4j also in our classpath and It was able to find that class,
But, then I start to face new issue, In my code, I am loading RepositorySelectorfrom LogManager,
LogManager.setRepositorySelector(repoSel, guard);
Now, instead of referring to log4j specific LogManager, It is referring to log4j-over-slf4j specific LogManager, due to which , I am getting below error in websphere server console.
Caused by: java.lang.NoSuchMethodError: org/apache/log4j/LogManager.setRepositorySelector(Lorg/apache/log4j/spi/RepositorySelector;Ljava/lang/Object;)V**
Please help me know, how can we remove the conflict, so that, It's able to refer proper log4j1.2.15 specific LogManager.
And, as jar which is using log4j is external to our system, we don't have much control over that.
Below is the complete stack trace.
Caused by: java.lang.NoSuchMethodError: org/apache/log4j/LogManager.setRepositorySelector(Lorg/apache/log4j/spi/RepositorySelector;Ljava/lang/Object;)V
at com.hsbc.es.logging.def.impl.log4j.Log4jLoggingTypeProvider.setContextualRepositorySelector(Log4jLoggingTypeProvider.java:117)
at com.hsbc.es.logging.def.impl.log4j.Log4jLoggingTypeProvider.<clinit>(Log4jLoggingTypeProvider.java:97)
at java.lang.J9VMInternals.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1887)
at com.hsbc.es.logging.LoggingTypeManagerFactory.discoverContextLoggingTypeManagerSPI(LoggingTypeManagerFactory.java:168)
at com.hsbc.es.logging.LoggingTypeManagerFactory.getContextLoggingTypeManagerSPI(LoggingTypeManagerFactory.java:98)
at com.hsbc.es.logging.def.LoggingTypeProviderFactory.getContextLoggingTypeProvider(LoggingTypeProviderFactory.java:49)
at com.hsbc.es.logging.def.LoggingTypeFactory.getDebugger(LoggingTypeFactory.java:58)

You can exclude the transitive log4j dependency from being imported by the dependency that includes it.
In your pom.xml you can tell update your dependency import in order to exclude log4j:
<dependencies>
<dependency>
<groupId>the.group.id</groupId>
<actifactId>the.artifact.id</artifactId>
<version>version-SNAPSHOT</version>
<exclusions>
<exclusion>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>

Error not resolved

Following run time error is coming:
javax/servlet/jsp/jstl/core/Config
Caused by:
java.lang.ClassNotFoundException - javax.servlet.jsp.jstl.core.Config
I have also downloaded jstl-1.2.jar and jsp-api-2.0.jar file still above error is not resolving. So please help me...

The first check that you IDE accolumate your project and coppy all liblriry in startUp folder. Very often users foregot that.
and check that you have this jar
maven
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>

You need javax.servlet.jsp.jstl.jar file.
Download from here and include it in your project class path.

Storm Topology not submit

i have configured my machine zookeeper,nimbus,supervisor are running properly and my topology working in LocalCluster
LocalCluster cluster = new LocalCluster();
cluster.submitTopology("SendPost", conf, builder.createTopology());
Utils.sleep(10000000000l);
cluster.killTopology("SendPost");
cluster.shutdown();
now i want try submit my topology bt it not working
/usr/local/storm/bin$ ./storm jar /home/winoria/Desktop/Storm/storm-starter/target/storm-starter-0.0.1-SNAPSHOT-jar-with-dependencies.jar com.winoria.post.PostTopology Post
i getting following error
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/local/storm/lib/logback-classic-1.0.6.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/winoria/Desktop/Storm/storm-starter/target/storm-starter-0.0.1-SNAPSHOT-jar-with-dependencies.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
Running: java -client -Dstorm.options= -Dstorm.home=/usr/local/storm -Djava.library.path=/usr/local/lib:/opt/local/lib:/usr/lib -Dstorm.conf.file= -cp /usr/local /storm/storm-netty-0.9.0.1.jar:/usr/local/storm/storm-console-logging-0.9.0.1.jar:/usr/local/storm/storm-core-0.9.0.1.jar:/usr/local/storm/lib/httpcore-4.1.jar:/usr/local/storm/lib/carbonite-1.5.0.jar:/usr/local/storm/lib/mockito-all-1.9.5.jar:/usr/local/storm/lib/commons-io-1.4.jar:/usr/local/storm/lib/commons-fileupload-1.2.1.jar:/usr/local/storm/lib/jgrapht-0.8.3.jar:/usr/local/storm/lib/ring-jetty-adapter-0.3.11.jar:/usr/local/storm/lib/jzmq-2.1.0.jar:/usr/local/storm/lib/asm-4.0.jar:/usr/local/storm/lib/logback-core-1.0.6.jar:/usr/local/storm/lib/tools.nrepl-0.2.3.jar:/usr/local/storm/lib/compojure-1.1.3.jar:/usr/local/storm/lib/json-simple-1.1.jar:/usr/local/storm/lib/ring-devel-0.3.11.jar:/usr/local/storm/lib/commons-logging-1.1.1.jar:/usr/local/storm/lib/httpclient-4.1.1.jar:/usr/local/storm/lib/reflectasm-1.07-shaded.jar:/usr/local/storm/lib/commons-exec-1.1.jar:/usr/local/storm/lib/guava-13.0.jar:/usr/local/storm/lib/clout-1.0.1.jar:/usr/local/storm/lib/objenesis-1.2.jar:/usr/local/storm/lib/slf4j-api-1.6.5.jar:/usr/local/storm/lib/clojure-1.4.0.jar:/usr/local/storm/lib/jetty-6.1.26.jar:/usr/local/storm/lib/hiccup-0.3.6.jar:/usr/local/storm/lib/clj-stacktrace-0.2.2.jar:/usr/local/storm/lib/log4j-over-slf4j-1.6.6.jar:/usr/local/storm/lib/tools.logging-0.2.3.jar:/usr/local/storm/lib/ring-core-1.1.5.jar:/usr/local/storm/lib/zookeeper-3.3.3.jar:/usr/local/storm/lib/math.numeric-tower-0.0.1.jar:/usr/local/storm/lib/disruptor-2.10.1.jar:/usr/local/storm/lib/minlog-1.2.jar:/usr/local/storm/lib/core.incubator-0.1.0.jar:/usr/local/storm/lib/servlet-api-2.5-20081211.jar:/usr/local/storm/lib/netty-3.6.3.Final.jar:/usr/local/storm/lib/ring-servlet-0.3.11.jar:/usr/local/storm/lib/clj-time-0.4.1.jar:/usr/local/storm/lib/snakeyaml-1.11.jar:/usr/local/storm/lib/commons-codec-1.4.jar:/usr/local/storm/lib/tools.cli-0.2.2.jar:/usr/local/storm/lib/logback-classic-1.0.6.jar:/usr/local/storm/lib/servlet-api-2.5.jar:/usr/local/storm/lib/kryo-2.17.jar:/usr/local/storm/lib/joda-time-2.0.jar:/usr/local/storm/lib/curator-client-1.0.1.jar:/usr/local/storm/lib/libthrift7-0.7.0-2.jar:/usr/local/storm/lib/tools.macro-0.1.0.jar:/usr/local/storm/lib/jline-0.9.94.jar:/usr/local/storm/lib/clojure-complete-0.2.3.jar:/usr/local/storm/lib/curator-framework-1.0.1.jar:/usr/local/storm/lib/commons-lang-2.5.jar:/usr/local/storm/lib/junit-3.8.1.jar:/usr/local/storm/lib/jetty-util-6.1.26.jar:/home/winoria/Desktop/Storm/storm-starter/target/storm-starter-0.0.1-SNAPSHOT-jar-with-dependencies.jar:/usr/local/storm/conf:/usr/local/storm/bin -Dstorm.jar=/home/winoria/Desktop/Storm/storm-starter/target/storm-starter-0.0.1-SNAPSHOT-jar-with-dependencies.jar com.winoria.post.PostTopology Post
SLF4J: Detected both log4j-over-slf4j.jar AND slf4j-log4j12.jar on the class path, preempting StackOverflowError.
SLF4J: See also http://www.slf4j.org/codes.html#log4jDelegationLoop for more details.
Exception in thread "main" java.lang.ExceptionInInitializerError
at org.apache.log4j.Logger.getLogger(Logger.java:39)
at org.apache.log4j.Logger.getLogger(Logger.java:43)
at com.rapportive.storm.spout.AMQPSpout.<clinit>(AMQPSpout.java:67)
at com.winoria.post.PostTopology.main(PostTopology.java:33)
Caused by: java.lang.IllegalStateException: Detected both log4j-over-slf4j.jar AND slf4j- log4j12.jar on the class path, preempting StackOverflowError. See also http://www.slf4j.org/codes.html#log4jDelegationLoop for more details.
at org.apache.log4j.Log4jLoggerFactory.<clinit>(Log4jLoggerFactory.java:49)
... 4 more
plz help me ...........
thanks in advance

I used cassandra and cassandra-all version 1.6.1 declares both log4j and slf4j-log4j12 as compile-time dependencies so I add following dependencies and my topology work like charm !!!
<dependencies>
<dependency>
<groupId> org.apache.cassandra</groupId>
<artifactId>cassandra-all</artifactId>
<version>1.1.6</version>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
<exclusion>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>

Try to exclude either log4j-over-slf4j.jar or slf4j-log4j12.jar from your classpath. I don't know which build tool do you use. Check the documentation of your build tool to see how to exclude a dependency.
For more reference: Detected both log4j-over-slf4j.jar AND slf4j-log4j12.jar on the class path, preempting StackOverflowError

You have to exclude all occurrences of slf4j-log4j12.jar . . . It doesn't work if you exclude all occurrences of log4j-over-slf4j.jar because Apache Storm adds log4j-over-slf4j at runtime (through the storm-core dependency in your pom.xml). Even when I added exclude log4j-over-slf4j to the storm-core dependency it would still be brought back at runtime.

If after exclude either log4j-over-slf4j.jar or slf4j-log4j12.jar , you still got this error. See in your jar, if both these two classes exist: org.slf4j.impl.log4jloggerfactory and org.apache.log4j.log4jloggerfactory .
And then find if any other jars besides slf4j and log4j contains these two classes.
In my situation， there is org.slf4j.impl.log4jloggerfactory in activemq. The error log really mislead me for a long time.

no such method jsch.JSch.setLogger

The below behavior occurs when i call the getSftpUtil(). I have also ensured that all the appropriate jars are in the maven project's external libraries and are available in the WEB-INF/lib folder of the project
code
net.sf.opensftp.SftpUtil util = SftpUtilFactory.getSftpUtil();
stacktrace
SftpUtilFactory: Trying to get SftpUtil class name from the system property net.sf.opensftp.SftpUtil
SftpUtilFactory - Trying to get SftpUtil class name from the system property net.sf.opensftp.SftpUtil
SftpUtilFactory: The system property net.sf.opensftp.SftpUtil is not set.
SftpUtilFactory - The system property net.sf.opensftp.SftpUtil is not set.
SftpUtilFactory: Use the default one.
SftpUtilFactory - Use the default one.
Caused by: java.lang.NoSuchMethodError: com.jcraft.jsch.JSch.setLogger(Lcom/jcraft/jsch/Logger;)V
at net.sf.opensftp.impl.SftpUtil.<clinit>(SftpUtil.java:110)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at net.sf.opensftp.SftpUtilFactory.getSftpUtil(SftpUtilFactory.java:184)

Based on jcraft's change log, setLogger is a method added to JSch.java in jsch-0.1.30. So the jar under your WEB-INF/lib should be an older version.
You can run
mvn dependency:tree
to see which of your dependencies is using the older version, and then exclude it with something like this:
<dependency>
<groupId>...</groupId>
<artifactId>...</artifactId>
<version>...</version>
<exclusions>
<exclusion>
<groupId>com.jcraft</groupId>
<artifactId>jsch</artifactId>
</exclusion>
</exclusions>
</dependency>
You probably have another dependency refer to a more recent version of jsch, so your problem should be solved at this point. However, if that's not the case, you can add this to pom.xml:
<dependency>
<groupId>com.jcraft</groupId>
<artifactId>jsch</artifactId>
<version>0.1.50</version>
</dependency>

Well, I guess you are missing this dependency or the proper version:
<groupId>com.jcraft</groupId>
<artifactId>jsch</artifactId>
<version>0.1.49</version> <!--latest version -->