Welche Datenbank nehme ich am besten? :)

[Hm...]

danke für die antworten.

ich habe die drei jar dateien von

http://www.hypergraphdb.org/learn?page=TrivialTutorial&project=hypergraphdb

in mein java projekt eingebaut und

HyperGraph graph = new HyperGraph("/path/to/workdir/bje");
String hello = graph.get(graph.add("Hello World"));
System.out.println(hello.toLowerCase());
graph.close();

getestet.

als fehlermeldung kam:

Exception in thread "main" org.hypergraphdb.HGException: java.lang.NoClassDefFoundError: com/sleepycat/db/DatabaseException
at org.hypergraphdb.HyperGraph.open(HyperGraph.java:392)
at org.hypergraphdb.HyperGraph.open(HyperGraph.java:211)
at org.hypergraphdb.HyperGraph.<init>(HyperGraph.java:198)
at SortData.main(SortData.java:36)
Caused by: java.lang.NoClassDefFoundError: com/sleepycat/db/DatabaseException
at org.hypergraphdb.HGStore.<init>(HGStore.java:47)
at org.hypergraphdb.HyperGraph.open(HyperGraph.java:310)
... 3 more
Caused by: java.lang.ClassNotFoundException: com.sleepycat.db.DatabaseException
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)
... 5 more

mit marvin etc kenne ich mich nicht aus, was müsste ich machen, um das problem zu beheben?