Github user jburwell commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/801#discussion_r39907517
  
    --- Diff: 
plugins/network-elements/nuage-vsp/src/net/nuage/vsp/acs/NuageVspPluginClientLoader.java
 ---
    @@ -19,28 +19,86 @@
     
     package net.nuage.vsp.acs;
     
    +import net.nuage.vsp.acs.client.NuageVspApiClient;
    +import net.nuage.vsp.acs.client.NuageVspElementClient;
    +import net.nuage.vsp.acs.client.NuageVspGuruClient;
    +import net.nuage.vsp.acs.client.NuageVspManagerClient;
    +import net.nuage.vsp.acs.client.NuageVspSyncClient;
    +
     import java.net.MalformedURLException;
     import java.net.URL;
     import java.net.URLClassLoader;
     
     public class NuageVspPluginClientLoader {
     
    -    private static NuageVspPluginClientLoader 
nuageVspPluginClientClassloader;
    -    private ClassLoader loader = null;
    +    private ClassLoader _loader = null;
    +
    +    private NuageVspApiClient _nuageVspApiClient;
    +    private NuageVspElementClient _nuageVspElementClient;
    +    private NuageVspGuruClient _nuageVspGuruClient;
    +    private NuageVspManagerClient _nuageVspManagerClient;
    +    private NuageVspSyncClient _nuageVspSyncClient;
    +
    +    public static final String NUAGE_PLUGIN_CLIENT_JAR_FILE = 
"/usr/share/nuagevsp/lib/nuage-vsp-acs-client.jar";
    +    private static final String NUAGE_VSP_API_CLIENT_IMPL = 
"net.nuage.vsp.acs.client.impl.NuageVspApiClientImpl";
    +    private static final String NUAGE_VSP_SYNC_CLIENT_IMPL = 
"net.nuage.vsp.acs.client.impl.NuageVspSyncClientImpl";
    +    private static final String NUAGE_VSP_ELEMENT_CLIENT_IMPL = 
"net.nuage.vsp.acs.client.impl.NuageVspElementClientImpl";
    +    private static final String NUAGE_VSP_GURU_CLIENT_IMPL = 
"net.nuage.vsp.acs.client.impl.NuageVspGuruClientImpl";
    +    private static final String NUAGE_VSP_MANAGER_CLIENT_IMPL = 
"net.nuage.vsp.acs.client.impl.NuageVspManagerClientImpl";
     
         private NuageVspPluginClientLoader(String 
nuagePluginClientJarLocation) {
             try {
    -            loader = URLClassLoader.newInstance(new URL[] {new 
URL("jar:file:" + nuagePluginClientJarLocation + "!/")},
    +            _loader = URLClassLoader.newInstance(new URL[] {new 
URL("jar:file:" + nuagePluginClientJarLocation + "!/")},
                         getClass().getClassLoader());
             } catch (MalformedURLException e) {
                 e.printStackTrace();
    --- End diff --
    
    ``printStackTrace()`` emits to stdout which will result in this stack trace 
being lost due to redirection.  Log the exception instead with a message 
explaining what operation was being performed.


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