[collectd] Java plugin can't find our classes

[Nicholas Sterling]

Hi, folks.  We are first-time users of collectd, trying to write a Java plugin 
to collect some data.  So far we can't seem to get the Java plugin to find our 
classes; we get this error:

     java plugin: cjni_config_load_plugin: FindClass 
(com/coraid/cms/pe/HBAMetrics) failed.
     java plugin: Configuration block for `HBAMetrics' found, but no such 
configuration callback has been registered. Please make sure, the `LoadPlugin' 
lines precede the `Plugin' blocks.

We have tried many things to get around this, but nothing works. What are we 
missing?  Presumably the above means that the Java plugin cannot find our class 
on the classpath specified in java.class.path, but we think we've set it up 
correctly.  Our config block for the plugin looks like this:

   <Plugin "java">
        JVMArg "-verbose:jni"
        JVMArg 
"-Djava.class.path=/opt/collectd/share/collectd/java/coraid-plugin.jar:/opt/collectd/share/collectd/java/collectd-api.jar"
        LoadPlugin "com/coraid/cms/pe/HBAMetrics"
        <Plugin "HBAMetrics">
        </Plugin>
   </Plugin>

Here's the JAR file:

   # pwd
   /opt/collectd/share/collectd/java

   # ls
   collectd-api.jar  coraid-plugin.jar  generic-jmx.jar

   # jar tf coraid-plugin.jar
   META-INF/
   META-INF/MANIFEST.MF
   com/
   com/coraid/
   com/coraid/cms/
   com/coraid/cms/pe/
   com/coraid/cms/pe/MetricData.class
   com/coraid/cms/pe/HBAMetrics.class

And here is the HBAMetrics class:

   # jar xf coraid-plugin.jar com/coraid/cms/pe/HBAMetrics

   # javap com.coraid.cms.pe.HBAMetrics
   Compiled from "HBAMetrics.java"
   public class com.coraid.cms.pe.HBAMetrics implements 
org.collectd.api.CollectdConfigInterface,org.collectd.api.CollectdInitInterface,org.collectd.api.CollectdReadInterface,org.collectd.api.CollectdShutdownInterface
 {
      public static final java.lang.String PLUGIN_NAME;
      public com.coraid.cms.pe.HBAMetrics();
      public int config(org.collectd.api.OConfigItem);
      public int init();
      public int read();
      public int shutdown();
   }

Thanks for any help with this urgent (for us) problem.

Nicholas


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