SSDM-9409 : Updating Jython to get JDK11 working

datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/shared/utils/Jython27ClassLoader.java

@@ -28,10 +28,13 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import ch.systemsx.cisd.common.logging.LogCategory;
+import ch.systemsx.cisd.common.logging.LogFactory;
 import org.apache.commons.io.IOUtils;
 
 import ch.systemsx.cisd.base.exceptions.CheckedExceptionTunnel;
 import ch.systemsx.cisd.common.exceptions.EnvironmentFailureException;
+import org.apache.log4j.Logger;
 
 /**
  * Special class loader for classes based on jython 2.7. The jython JAR file has to be provided in the
@@ -49,6 +52,7 @@ import ch.systemsx.cisd.common.exceptions.EnvironmentFailureException;
  */
 public class Jython27ClassLoader extends ClassLoader
 {
+    private static final Logger machineLog = LogFactory.getLogger(LogCategory.MACHINE, Jython27ClassLoader.class);
     private static final List<String> EXCLUDED_PACKAGES_STARTS = Arrays.asList("java", "jdk.", "sun.", "com.sun.");
     private final URLClassLoader jythonJarClassLoader;
     private final Map<String, Class<?>> cachedClasses = new HashMap<>();
@@ -75,6 +79,7 @@ public class Jython27ClassLoader extends ClassLoader
     @Override
     protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException
     {
+        machineLog.info("loadClass - name: " + name + " resolve: " + resolve);
         Class<?> clazz = cachedClasses.get(name);
         if (clazz == null)
         {
@@ -168,6 +173,7 @@ public class Jython27ClassLoader extends ClassLoader
     
     private Class<?> tryLoadClass(ClassLoader classLoader, String name)
     {
+        machineLog.info("loadClass - classLoader: " + classLoader + " name: " + name);
         synchronized (getClassLoadingLock(name))
         {
             InputStream stream = classLoader.getResourceAsStream(name.replace('.', '/') + ".class");