Fix #543 don't cast ClassLoader.getSystemClassLoader() to URLClassLoader

- the user can decide if a secure ClassLoader should be used by setting
  Config.URL_CLASS_LOADER=...
- if Config.URL_CLASS_LOADER==null; ClassLoader.getSystemClassLoader()
  is used
- Refactored JavaLinkTests to core module as JavaLinkTestCase JUnit
  tests
- Loaded classes have to be available on the classpath
- Config.FILESYSTEM_ENABLED = true m,uist be set;see JUnit tests

Author: axkr

symja_android_library/matheclipse-core/src/main/java/org/matheclipse/core/basic/Config.java

@@ -2,7 +2,6 @@
 
 import java.io.IOException;
 import java.io.InputStream;
-import java.net.URLClassLoader;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.Properties;
@@ -594,7 +593,7 @@ public static String getVersion() {
   public static int BUILTIN_PROTECTED = ISymbol.PROTECTED;
 
   /** Global dynamic classloader */
-  public static URLClassLoader URL_CLASS_LOADER = null;
+  public static ClassLoader URL_CLASS_LOADER = null;
 
   public static void setScriptCommandLine(final String[] args) {
     IASTAppendable commandLine = F.ListAlloc(args.length + 1);

symja_android_library/matheclipse-core/src/main/java/org/matheclipse/core/builtin/JavaFunctions.java

@@ -25,7 +25,6 @@
 import org.matheclipse.core.interfaces.IAST;
 import org.matheclipse.core.interfaces.IExpr;
 import org.matheclipse.core.interfaces.ISymbol;
-import org.matheclipse.parser.client.ParserConfig;
 
 public class JavaFunctions {
   private static final Logger LOGGER = LogManager.getLogger();
@@ -38,15 +37,13 @@ private static class Initializer {
 
     private static void init() {
       if (!Config.FUZZY_PARSER) {
-        if (!ParserConfig.PARSER_USE_LOWERCASE_SYMBOLS) {
           S.AddToClassPath.setEvaluator(new AddToClassPath());
           S.InstanceOf.setEvaluator(new InstanceOf());
           S.JavaNew.setEvaluator(new JavaNew());
           S.JavaObject.setEvaluator(new JavaObject());
           S.JavaObjectQ.setEvaluator(new JavaObjectQ());
           S.LoadJavaClass.setEvaluator(new LoadJavaClass());
           S.SameObjectQ.setEvaluator(new SameObjectQ());
-        }
       }
     }
   }
@@ -57,9 +54,9 @@ private static class AddToClassPath extends AbstractEvaluator {
     public IExpr evaluate(final IAST ast, EvalEngine engine) {
       try {
         if (Config.URL_CLASS_LOADER == null) {
-          Config.URL_CLASS_LOADER = (URLClassLoader) ClassLoader.getSystemClassLoader();
+          Config.URL_CLASS_LOADER = ClassLoader.getSystemClassLoader();
         }
-        URLClassLoader child = Config.URL_CLASS_LOADER;
+        ClassLoader child = Config.URL_CLASS_LOADER;
         for (int i = 1; i < ast.size(); i++) {
           IExpr arg = ast.get(i);
           if (arg.isString()) {
@@ -129,7 +126,7 @@ public IExpr evaluate(final IAST ast, EvalEngine engine) {
       if (arg2.isString()) {
         try {
           if (Config.URL_CLASS_LOADER == null) {
-            Config.URL_CLASS_LOADER = (URLClassLoader) ClassLoader.getSystemClassLoader();
+            Config.URL_CLASS_LOADER = ClassLoader.getSystemClassLoader();
           }
           arg2 = JavaClassExpr.newInstance(arg2.toString(), Config.URL_CLASS_LOADER);
         } catch (ClassNotFoundException cnfex) {
@@ -205,7 +202,7 @@ public IExpr evaluate(final IAST ast, EvalEngine engine) {
         if (arg1.isString()) {
           try {
             if (Config.URL_CLASS_LOADER == null) {
-              Config.URL_CLASS_LOADER = (URLClassLoader) ClassLoader.getSystemClassLoader();
+              Config.URL_CLASS_LOADER = ClassLoader.getSystemClassLoader();
             }
             arg1 = JavaClassExpr.newInstance(arg1.toString(), Config.URL_CLASS_LOADER);
           } catch (ClassNotFoundException cnfex) {
@@ -444,7 +441,7 @@ public IExpr evaluate(final IAST ast, EvalEngine engine) {
           try {
             String className = arg1.toString();
             if (Config.URL_CLASS_LOADER == null) {
-              Config.URL_CLASS_LOADER = (URLClassLoader) ClassLoader.getSystemClassLoader();
+              Config.URL_CLASS_LOADER = ClassLoader.getSystemClassLoader();
             }
             JavaClassExpr jClazz = JavaClassExpr.newInstance(className, Config.URL_CLASS_LOADER);
             Class<?> clazz = jClazz.toData();

…eclipse/core/javalink/JavaLinkTests.java …clipse/core/system/JavaLinkTestCase.javasymja_android_library/matheclipse-io/src/test/java/org/matheclipse/core/javalink/JavaLinkTests.java renamed to symja_android_library/matheclipse-core/src/test/java/org/matheclipse/core/system/JavaLinkTestCase.java symja_android_library/matheclipse-io/src/test/java/org/matheclipse/core/javalink/JavaLinkTests.java renamed to symja_android_library/matheclipse-core/src/test/java/org/matheclipse/core/system/JavaLinkTestCase.java

@@ -1,15 +1,16 @@
-package org.matheclipse.core.javalink;
+package org.matheclipse.core.system;
 
 import org.matheclipse.core.basic.Config;
+import org.matheclipse.core.basic.ToggleFeature;
 import org.matheclipse.core.eval.EvalEngine;
-import org.matheclipse.core.interfaces.ISymbol;
-import org.matheclipse.core.rubi.AbstractRubiTestCase;
-import org.matheclipse.io.IOInit;
+import org.matheclipse.core.eval.ExprEvaluator;
+import org.matheclipse.core.expression.F;
+import org.matheclipse.parser.client.ParserConfig;
 
-public class JavaLinkTests extends AbstractRubiTestCase {
+public class JavaLinkTestCase extends ExprEvaluatorTestCase {
 
-  public JavaLinkTests(String name) {
-    super(name, false);
+  public JavaLinkTestCase(String name) {
+    super(name);
   }
 
   public void testJavaNew001() {
@@ -19,7 +20,7 @@ public void testJavaNew001() {
         + "dm = JavaNew[\"java.text.DecimalFormat\", \"#.00\", ds]", //
         "JavaObject[class java.text.DecimalFormat]");
     check("dm@format[0.815]", //
-        "\".81\"");
+        ".81");
   }
 
   public void testInstanceOf001() {
@@ -39,19 +40,20 @@ public void testLoadJavaClass001() {
     check("clazz= LoadJavaClass[\"java.lang.Math\"]", //
         "JavaClass[java.lang.Math]");
     check("Math`sin[0.5]", //
-        "0.479425538604203");
+        "0.479426");
   }
 
-  public void testLoadJavaClass002() {
-    check("clazz= LoadJavaClass[\"org.jsoup.Jsoup\"]", //
-        "JavaClass[org.jsoup.Jsoup]");
-    check("conn=Jsoup`connect[\"https://jsoup.org/\"];", //
-        "Null");
-    check("doc=conn@get[ ];", //
-        "Null");
-    check("Print[doc@title[ ]];", //
-        "Null");
-  }
+  // will only work if JSoup is on classpath
+  // public void testLoadJavaClass002() {
+  // check("clazz= LoadJavaClass[\"org.jsoup.Jsoup\"]", //
+  // "JavaClass[org.jsoup.Jsoup]");
+  // check("conn=Jsoup`connect[\"https://jsoup.org/\"];", //
+  // "Null");
+  // check("doc=conn@get[ ];", //
+  // "Null");
+  // check("Print[doc@title[ ]];", //
+  // "Null");
+  // }
 
   public void testJavaObjectQ001() {
 
@@ -85,13 +87,34 @@ public void testJavaShow001() {
   /** The JUnit setup method */
   @Override
   protected void setUp() {
-    Config.BUILTIN_PROTECTED = ISymbol.NOATTRIBUTE;
-    super.setUp();
-    fSeconds = 600;
-    Config.SHORTEN_STRING_LENGTH = 1024;
-    Config.MAX_AST_SIZE = 1000000;
-    EvalEngine.get().setIterationLimit(50000);
-    IOInit.init();
+    try {
+      synchronized (fScriptManager) {
+        ToggleFeature.COMPILE = true;
+        ToggleFeature.COMPILE_PRINT = true;
+        Config.SHORTEN_STRING_LENGTH = 80;
+        Config.MAX_AST_SIZE = 20000;
+        Config.MAX_MATRIX_DIMENSION_SIZE = 100;
+        Config.MAX_BIT_LENGTH = 200000;
+        Config.MAX_POLYNOMIAL_DEGREE = 100;
+        Config.FILESYSTEM_ENABLED = true;
+        // if you need MMA syntax set relaxedSyntax = false;
+        boolean relaxedSyntax = true;
+        ParserConfig.PARSER_USE_LOWERCASE_SYMBOLS = relaxedSyntax;
+        F.await();
+
+        EvalEngine engine = new EvalEngine(relaxedSyntax);
+        EvalEngine.set(engine);
+        engine.init();
+        engine.setRecursionLimit(512);
+        engine.setIterationLimit(500);
+        engine.setOutListDisabled(false, (short) 10);
+
+        evaluator = new ExprEvaluator(engine, false, (short) 100);
+        evaluatorN = new ExprEvaluator(engine, false, (short) 100);
+      }
+    } catch (Exception e) {
+      e.printStackTrace();
+    }
   }
 
   @Override