aphyr
commented
8 years ago Sounds like some sort of JNA problem, but I haven't seen this before so I'm not sure. Perhaps your system java doesn't use that libjna?
Closed alf239 closed 6 years ago
aphyr
commented
8 years ago Sounds like some sort of JNA problem, but I haven't seen this before so I'm not sure. Perhaps your system java doesn't use that libjna?
alf239
commented
8 years ago It does sound like that indeed; but I thought JNA is a self-containing .jar? Do I need any special dance for openjdk to use JNA? (I'll google for sure and will report if/when solved, it's just if you happen to know, that'd be great)
alf239
commented
8 years ago One more question... at https://github.com/aphyr/jepsen, you say that one needs to install libjna-java; but then it's a self-containing jar, and maven/leiningen downloads it just fine on its own—why would one need to install it?
alf239
commented
8 years ago JNA itself seems to be fine:
alexey@instance-1:~/jna-test$ cat HelloWorld.java
import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.Platform;
/** Simple example of JNA interface mapping and usage. */
public class HelloWorld {
// This is the standard, stable way of mapping, which supports extensive
// customization and mapping of Java to native types.
public interface CLibrary extends Library {
CLibrary INSTANCE = (CLibrary)
Native.loadLibrary((Platform.isWindows() ? "msvcrt" : "c"),
CLibrary.class);
void printf(String format, Object... args);
}
public static void main(String[] args) {
CLibrary.INSTANCE.printf("Hello, World\n");
for (int i=0;i < args.length;i++) {
CLibrary.INSTANCE.printf("Argument %d: %s\n", i, args[i]);
}
}
}
alexey@instance-1:~/jna-test$ javac -classpath /usr/share/java/jna.jar HelloWorld.java
alexey@instance-1:~/jna-test$ java -classpath /usr/share/java/jna.jar:. HelloWorld
Hello, World
alexey@instance-1:~/jna-test$ The JNA in the maven repo isn't:
alexey@instance-1:~/jna-test$ javac -classpath ~/.m2/repository/net/java/dev/jna/jna/3.4.0/jna-3.4.0.jar HelloWorld.java
alexey@instance-1:~/jna-test$ java -classpath ~/.m2/repository/net/java/dev/jna/jna/3.4.0/jna-3.4.0.jar:. HelloWorld
Exception in thread "main" java.lang.UnsatisfiedLinkError: Can't obtain static newInstance method for class com.sun.jna.Structure
at com.sun.jna.Native.initIDs(Native Method)
at com.sun.jna.Native.<clinit>(Native.java:135)
at HelloWorld$CLibrary.<clinit>(HelloWorld.java:14)
at HelloWorld.main(HelloWorld.java:21)
alexey@instance-1:~/jna-test$ It seems that it might make sense to upgrade JNA in jepsen dependencies...
alf239
commented
8 years ago Changing the project file to
(defproject jepsen.hazelcast "0.1.0-SNAPSHOT"
:description "Jepsen: Hazelcast"
:url "http://www.kamchatkaltd.co.uk/jepsen-hazelcast"
:license {:name "Eclipse Public License"
:url "http://www.eclipse.org/legal/epl-v10.html"}
:dependencies [[org.clojure/clojure "1.7.0"]
[jepsen "0.0.9" :exclude net.java.dev.jna/jna]
[avout "0.5.4"]
[net.java.dev.jna/jna "4.1.0"]])seems to do the trick.
alf239
commented
8 years ago Yep, it does... @aphyr, will it make any sense to adjust the tutorial and/or the dependencies? I solved the problem for myself by overriding the dependency, but am happy to dig further, e.g. finding a compatible version of jsch.
aphyr
commented
8 years ago Looks like this jna dep is required by com.jcraft/jsch.agentproxy.usocket-jna, which is pulled in by clj-ssh 0.5.14, so if you're having compatibility problems with that jna package, perhaps it's worth filing a ticket on jsch? Since this has (so far) worked for other users, I'm hesitant to add a dep exclusion that could break that support--but I also don't understand JNA that well so I could be wrong.
sani3854
commented
7 years ago java.lang.ExceptionInInitializerError
at com.neurotec.lang.NCore.
How to solution this error
sani3854
commented
7 years ago java.lang.ExceptionInInitializerError
at com.neurotec.lang.NCore.
how to solution of this error ??? rep me
aphyr
commented
7 years ago Sounds like your JVM doesn't have JNA set up?
Trying to follow https://github.com/aphyr/jepsen/blob/master/doc/scaffolding.md, got the following problem at the step "Next, we'll replace the example test that lein generated (test/jepsen/zookeeper_test.clj) with one that calls the zk-test function, runs the test that function returns, looks at the results, and ensures that the :valid? key is true."
The stack trace is as follows:
(I did call the test
jepsen.hazelcast, but otherwise it's the same dummy test)The system is as follows: