title: java.lang.IncompatibleClassChangeError: Implementing class Mongo
body: <p>I am not able to figure out why I get this error. I tried cleaning up libs that are redundant and so forth.</p>
  
  <p>I get the error when I try to do:</p>
  
  <pre><code>  mongo = new Mongo(host, port);
  </code></pre>
  
  <p>The funny thing is that I can run any unit tests I made from IDE (IntelliJ), but when I try to run it through Tomcat I get this:</p>
  
  <pre><code>  Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.
      sfatandrei.db.MongoManager]: Constructor threw exception; nested exception is java.lang.IncompatibleCla
      ssChangeError: Implementing class
          at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:162)
          at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInst
      antiationStrategy.java:110)
          at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(Constructo
      rResolver.java:280)
          ... 82 more
      Caused by: java.lang.IncompatibleClassChangeError: Implementing class
          at java.lang.ClassLoader.defineClass1(Native Method)
          at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
          at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
          at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2889)
          at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1170)
          at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678)
          at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1556)
          at java.lang.ClassLoader.defineClass1(Native Method)
          at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
          at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
          at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2889)
          at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1170)
          at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678)
          at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1556)
          at com.mongodb.MongoOptions.reset(MongoOptions.java:47)
          at com.mongodb.MongoOptions.&lt;init&gt;(MongoOptions.java:29)
          at com.mongodb.Mongo.&lt;init&gt;(Mongo.java:148)
          at com.mongodb.Mongo.&lt;init&gt;(Mongo.java:137)
          at com.sfatandrei.db.MongoManager.&lt;init&gt;(MongoManager.java:28)
          at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
          at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
          at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.
      java:45)
          at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
          at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147)
          ... 84 more
  </code></pre>
  
  <p><code>mvn dependency:tree -Dverbose</code></p>
  
  <pre><code>[INFO] 
  [INFO] --- maven-dependency-plugin:2.1:tree (default-cli) @ mongodb-performance-test ---
  [INFO] com.sfatandrei:mongodb-performance-test:war:1.0
  [INFO] +- junit:junit:jar:4.8.2:test
  [INFO] +- org.springframework:spring-core:jar:3.1.1.RELEASE:compile
  [INFO] |  +- org.springframework:spring-asm:jar:3.1.1.RELEASE:compile
  [INFO] |  \- (commons-logging:commons-logging:jar:1.1.1:compile - omitted for duplicate)
  [INFO] +- org.springframework:spring-beans:jar:3.1.1.RELEASE:compile
  [INFO] |  \- (org.springframework:spring-core:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] +- org.springframework:spring-context:jar:3.1.1.RELEASE:compile
  [INFO] |  +- org.springframework:spring-aop:jar:3.1.1.RELEASE:compile
  [INFO] |  |  +- (aopalliance:aopalliance:jar:1.0:compile - omitted for duplicate)
  [INFO] |  |  +- (org.springframework:spring-asm:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  |  +- (org.springframework:spring-beans:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  |  \- (org.springframework:spring-core:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  +- (org.springframework:spring-beans:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  +- (org.springframework:spring-core:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  +- org.springframework:spring-expression:jar:3.1.1.RELEASE:compile
  [INFO] |  |  \- (org.springframework:spring-core:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  \- (org.springframework:spring-asm:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] +- org.springframework:spring-jdbc:jar:3.1.1.RELEASE:compile
  [INFO] |  +- (org.springframework:spring-beans:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  +- (org.springframework:spring-core:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  \- org.springframework:spring-tx:jar:3.1.1.RELEASE:compile
  [INFO] |     +- (aopalliance:aopalliance:jar:1.0:compile - omitted for duplicate)
  [INFO] |     +- (org.springframework:spring-aop:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |     +- (org.springframework:spring-beans:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |     +- (org.springframework:spring-context:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |     \- (org.springframework:spring-core:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] +- org.springframework:spring-web:jar:3.1.1.RELEASE:compile
  [INFO] |  +- aopalliance:aopalliance:jar:1.0:compile
  [INFO] |  +- (org.springframework:spring-beans:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  +- (org.springframework:spring-context:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  \- (org.springframework:spring-core:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] +- org.springframework:spring-webmvc:jar:3.1.1.RELEASE:compile
  [INFO] |  +- (org.springframework:spring-asm:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  +- (org.springframework:spring-beans:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  +- (org.springframework:spring-context:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  +- org.springframework:spring-context-support:jar:3.1.1.RELEASE:compile
  [INFO] |  |  +- (org.springframework:spring-beans:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  |  +- (org.springframework:spring-context:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  |  \- (org.springframework:spring-core:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  +- (org.springframework:spring-core:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  +- (org.springframework:spring-expression:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  \- (org.springframework:spring-web:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] +- org.springframework.data:spring-data-mongodb:jar:1.0.0.RELEASE:compile
  [INFO] |  +- (org.springframework:spring-beans:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  +- (org.springframework:spring-expression:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  +- org.springframework.data:spring-data-commons-core:jar:1.2.0.RELEASE:compile
  [INFO] |  |  +- (org.springframework:spring-beans:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  |  \- (org.springframework:spring-tx:jar:3.1.1.RELEASE:compile - omitted for duplicate)
  [INFO] |  \- org.mongodb:mongo-java-driver:jar:2.7.1:compile
  [INFO] +- log4j:log4j:jar:1.2.16:compile
  [INFO] +- org.springframework:spring-test:jar:3.1.1.RELEASE:compile
  [INFO] +- commons-logging:commons-logging:jar:1.1.1:compile
  [INFO] +- javax.servlet:servlet-api:jar:2.5:provided
  [INFO] +- org.mongodb:bson:jar:2.3:compile
  [INFO] \- org.codehaus.jackson:jackson-mapper-asl:jar:1.9.6:compile
  [INFO]    \- org.codehaus.jackson:jackson-core-asl:jar:1.9.6:compile
  </code></pre>
  
  <p>I am using jdk 7, tomcat 7.0.27, maven 3.0.3.</p>