mongoDB: java.lang.IncompatibleClassChangeError: Implementing class

I am trying to write a little test-programm with different Databases. MongoDB is one of them and it worked perfectly fine until last Friday, even though I didn't change anything in the java code of my MongoDB class.

System: I use an ubuntu 14.04 VM with the package mongo-org. The version of mongo is 3.0.5.

I also run MariaDB, PostgreSQL and Cassandra on the VM. As a Client, I have windows 7 and Eclipse.

The connection and the test work perfectly fine with the other 3 databases.

And I can run the "mongo" client on ubuntu as well.

But when I try out the Java Test of MongoDB, I keep getting this error:

Exception in thread "main" java.lang.IncompatibleClassChangeError: Implementing class
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$100(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$100(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at com.mongodb.MongoClientOptions$Builder.<init>(MongoClientOptions.java:52)
    at com.mongodb.MongoClient.<init>(MongoClient.java:126)
    at com.mongodb.MongoClient.<init>(MongoClient.java:115)
    at de.motza.database.impl.DatabaseImplMongoDB.connect(DatabaseImplMongoDB.java:197)
    at de.motza.database.impl.DatabaseImplMongoDB.instantiate(DatabaseImplMongoDB.java:207)
    at de.motza.test.History_Log.testNewDatabase(History_Log.java:86)
    at de.motza.test.History_Log.main(History_Log.java:66) 

The part of the java Class, where the Exception occurs:

private static String dbHost = "10.158.251.251";
private static int dbPort = 27017;
private static String dbName = "history_log";
private static MongoClient mongoClient = null;
[...]
@Override
    public void connect() {
        try {
            mongoClient = new MongoClient(dbHost, dbPort);
            db = mongoClient.getDB(dbName);
        } catch (Exception e) {
            log.error(e);
        }

    }

I read about the disk-space, but I habe 12 GB free in my VM, so I do not think that this is the problem. I ran apt-get upgrade, but it didn't change anything either. I also reinstalled mongoDb, but nothing changed. I also tried to recompile, but nothing changed there either.

Does anybody have any advice?

ADDITION:

Here you find the library tab of my project. I use multiple databases, so I marked the ones important for MongoDB