Try to set system class loader -- not successful

hanslovsky · hanslovsky · commit f7be7376d4e6 · 2018-06-14T20:18:05.000-04:00
diff --git a/scyjava/__init__.py b/scyjava/__init__.py
@@ -1,3 +1,12 @@
+import os
+import pathlib
+import subprocess
+import tempfile
+tmp_dir = tempfile.mkdtemp()
+
+import jnius_config
+jnius_config.add_classpath(tmp_dir)
+
 def _get_logger(name):
     import logging
     return logging.getLogger(name)
@@ -42,6 +51,54 @@ def _init_jvm():
 _GrapeIvy    = _autoclass('groovy.grape.GrapeIvy')
 _grapeIvy    = _GrapeIvy()
 _classLoader = _autoclass('groovy.lang.GroovyClassLoader')()
+_Thread      = _autoclass('java.lang.Thread')
+_ClassLoader = _autoclass('java.lang.ClassLoader')
+get_class_loader_code="""
+import java.lang.Class;
+import java.lang.ClassLoader;
+import java.lang.reflect.Field;
+
+public class GetClassLoaderClass
+{
+  public static Class<ClassLoader> getClassLoaderClass()
+  {
+    return ClassLoader.class;
+  }
+
+  public static void setSystemClassLoader( ClassLoader classLoader ) throws IllegalAccessException, NoSuchFieldException
+  {
+    Field scl = getClassLoaderClass().getDeclaredField( "scl" );
+    scl.setAccessible( true );
+    scl.set( null, classLoader );
+  }
+}
+"""
+fp = pathlib.Path( tmp_dir ) / 'GetClassLoaderClass.java'
+print( tmp_dir )
+with open( fp, 'w' ) as f:
+    f.write( get_class_loader_code )
+
+
+javac = pathlib.Path( os.environ[ 'JAVA_HOME' ] ) / 'bin' / 'javac'
+proc = subprocess.run(
+    [ javac, '-cp', jnius_config.split_char.join( jnius_config.get_classpath() ), fp ],
+    stdout=subprocess.PIPE,
+    stderr=subprocess.PIPE)
+if proc.returncode != 0:
+    print("Failed!")
+    print ( proc.stderr )
+
+_GetClassLoaderClass = _autoclass('GetClassLoaderClass')
+_GetClassLoaderClass.setSystemClassLoader( _classLoader );
+print("System classloader", _ClassLoader.getSystemClassLoader().getClass().getName())
+
+# try:
+#     _scl = _GetClassLoaderClass.getClassLoaderClass().getDeclaredField('scl')
+#     print(_scl)
+#     _scl.setAccessible(True)
+#     _scl.set(None, _classLoader)
+# except JavaException as e:
+#     print(e)
 
 def _default_map(**extra_options):
     m = _HashMap()
@@ -68,12 +125,22 @@ def dependency(groupId, artifactId, version=None, **grape_options):
     return _grapeIvy.grab(m)
 
 def import_class(clazz):
-    loaded_class = _classLoader.loadClass(clazz)
+    try:
+        print("SETTING CLASSLOADER", _classLoader)
+        # _Thread.currentThread().setContextClassLoader(_cast('java.lang.ClassLoader',_classLoader))
+        _Thread.currentThread().setContextClassLoader(_classLoader)
+    except JavaException as e:
+        print( "e.classname    -- {}".format( e.classname ) )
+        print( "e.innermessage -- {}".format( e.innermessage ) )
+        # for st in e.stacktrace:
+        #     print( st )
+    # loaded_class = _classLoader.loadClass(clazz)
     # clz = Class(noinstance=True)
     # clz.instanciate_from(create_local_ref(j_env, jc))
-    # return _autoclass(clazz)
-    print( "CONSTRS ", loaded_class)
-    return _wrap_java_class(clazz, loaded_class)
+    print("classloader", _Thread.currentThread().getContextClassLoader().getClass().getName())
+    return _autoclass(clazz)
+    # print( "CONSTRS ", loaded_class)
+    # return _wrap_java_class(clazz, loaded_class)
 
 def list_grapes():
     grapes = _grapeIvy.enumerateGrapes()
diff --git a/test_scyjava.py b/test_scyjava.py
@@ -1,3 +1,7 @@
+import jnius_config
+jnius_config.add_classpath('/home/phil/git/scyjava2/groovy-3.0.0-alpha-2.jar')
+jnius_config.add_classpath('/home/phil/git/scyjava2/ivy-2.5.0-rc1.jar')
+
 import scyjava
 from jnius.reflect import Modifier
 print(Modifier)
