使用owl API的Java程序中的异常

Question

I am trying to run a simple example of a java program for owl ontology reasoning that i found online. It uses owl api and hermit reasoner. So i added the org.semanticweb.HermiT and owlapi-osgidistribution-4.0.2 libraries. Still i get the following exception :

Exception in thread "main" java.lang.NoClassDefFoundError: com/google/inject/Provider
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at obligation.Obligation.main(Obligation.java:43)
Caused by: java.lang.ClassNotFoundException: com.google.inject.Provider
    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)
    ... 25 more
Java Result: 1

I found in a similar question on stackoverflow that the solution is

You're missing the guava jars. For OWLAPI 4.0.2, you also need all other jars included in the maven dependencies. If you could not use Maven to build your code, you'll need to make sure all the dependencies are added manually.

i added that guava jars in my project but i didn't manage to solve the problem. Also i really don't know what are all that jars included in the maven dependencies. Could you please help me to solve this out?

Answer 1

You can either use maven to do your build, or use the following shortcut: download the owlapi-osgidistribution jar file and uncompress it; you'll find a lib folder inside it, with all the necessary jars.

Answer 2

The ClassNotFoundException tells you that the missing class is com.google.inject.Provider . This class is in Guice, not Guava, so you need to add the Guice jar to your project.

As you discovered, and as fge mentioned, this in turn requires the JSR-330 jar javax.inject which is where the javax.inject.Provider resides.