Error getting started

Flowable Engine
1

Hi,

I am getting started with flowable and I am following the tutorial of chapter 2.

At step 2.3.1 I am not able to run the HolidayRequest because of this error:

Failed to instantiate SLF4J LoggerFactory
Reported exception:
java.lang.NoClassDefFoundError: org/apache/log4j/Level
 at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150)
 at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)
 at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:412)
 at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)
 at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
 at org.flowable.engine.common.AbstractEngineConfiguration.<clinit>(AbstractEngineConfiguration.java:55)
 at org.flowable.HolidayRequest.main(HolidayRequest.java:11)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Level
 at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
 ... 7 more
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/Level
 at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150)
 at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)
 at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:412)
 at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)
 at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
 at org.flowable.engine.common.AbstractEngineConfiguration.<clinit>(AbstractEngineConfiguration.java:55)
 at org.flowable.HolidayRequest.main(HolidayRequest.java:11)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Level
 at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
 ... 7 more

Apparently Level class from Log4j is missing. I am not used to Maven so I need some help to fix this issue.

Tks

2

Hi,

Just add the Log4j dependency to your Maven pom file. There will be plenty of examples on how to do it on stackoverflow or other sites.

Best regards,

Tijs

3

I am sorry I didn’t mentioned it. I have already tried to add this to the pom:

<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.0</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.0</version>
</dependency>

Nothing changes.

Tks