NullPointerException at net.java.games.util.plugins.Plugins.scanPlugins

keryax · June 28, 2013, 12:26pm

Hello.
I had dowanloaded sources from jinput.java.net; built it on linux with java 1.7.
libjinput-linux.so i’d copied to /usr/lib

When i connect jinput.jar to the project without any code - it crashes with:


Exception in thread "main" java.lang.NullPointerException
	at net.java.games.util.plugins.Plugins.scanPlugins(Plugins.java:78)
	at net.java.games.util.plugins.Plugins.<init>(Plugins.java:73)
	at net.java.games.util.plugins.test.PluginTest.<init>(PluginTest.java:85)
	at net.java.games.util.plugins.test.PluginTest.main(PluginTest.java:112)

What is wrong? :’(

gouessej · August 10, 2013, 7:42pm

Hi

Don’t copy the .so file into this directory, you just need to put it into the Java library path and jnput.jar must be in the classpath. I think that the directory “test_plugins” is not found. I use a source code a bit more recent than you:

github.com

sgothel/jutils/blob/master/src/main/java/net/java/games/util/plugins/Plugins.java#L81


/** Creates a new instance of Plugins
 * @param pluginRoot The root od the directory tree to scan for Jars
 * containing plugins.
 */
public Plugins(File pluginRoot) throws IOException {
        scanPlugins(pluginRoot);
}

private void scanPlugins(File dir) throws IOException {
    File[] files = dir.listFiles();
    if (files == null) {
        throw new FileNotFoundException("Plugin directory "+dir.getName()+
            " not found.");
    }
    for(int i=0;i<files.length;i++){
        File f = files[i];
        if (f.getName().endsWith(".jar")) { // process JAR file
            processJar(f);
        } else if (f.isDirectory()) {
            scanPlugins(f); // recurse
        }