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    Look if your classpath is correct, and check if the versions of your libraries match the version you described in your pom.xml

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java.lang.NoClassDefFoundError: org/apache/commons/modeler/BaseModelMBean	at java.lang.ClassLoader.defineClass1(Native Method)	at java.lang.ClassLoader.defineClass(ClassLoader.java:620)	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)	at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)	at java.net.URLClassLoader.access$100(URLClassLoader.java:56)	at java.net.URLClassLoader$1.run(URLClassLoader.java:195)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)	at java.lang.ClassLoader.loadClass(ClassLoader.java:251)	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)	at java.lang.Class.getDeclaredConstructors0(Native Method)	at java.lang.Class.privateGetDeclaredConstructors(Class.java:2357)	at java.lang.Class.getConstructor0(Class.java:2671)	at java.lang.Class.newInstance0(Class.java:321)	at java.lang.Class.newInstance(Class.java:303)	at org.apache.tomcat.util.digester.ObjectCreateRule.begin(ObjectCreateRule.java:206)	at org.apache.tomcat.util.digester.Rule.begin(Rule.java:153)	at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1276)	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:533)	at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:220)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:872)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1693)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:368)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:834)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148)	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1242)	at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1562)	at org.apache.catalina.startup.Catalina.load(Catalina.java:490)	at org.apache.catalina.startup.Catalina.load(Catalina.java:524)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:267)	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)