Resolving issue #1270, unexpected exception with simulation scripting

core/src/net/sf/openrocket/scripting/ScriptEngineManagerRedux.java

@@ -0,0 +1,430 @@
+/*
+ * This is a replacement for the ScriptEngineManager which gets around and issue with the sun.misc.ServiceConfigurationError
+ * which has been removed in Java 9+.  If using the ScriptEngineManager from the script-api*.jar then the sun.misc throws
+ * a ClassNotFoundException.
+ */
+
+/*
+ * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package net.sf.openrocket.scripting;
+
+import javax.script.*;
+import java.util.*;
+import java.security.*;
+import java.util.ServiceLoader;
+import java.util.ServiceConfigurationError;
+
+/**
+ * The <code>ScriptEngineManager</code> implements a discovery and instantiation
+ * mechanism for <code>ScriptEngine</code> classes and also maintains a
+ * collection of key/value pairs storing state shared by all engines created
+ * by the Manager. This class uses the service provider mechanism described in the
+ * {@link java.util.ServiceLoader} class to enumerate all the
+ * implementations of <code>ScriptEngineFactory</code>. <br><br>
+ * The <code>ScriptEngineManager</code> provides a method to return a list of all these factories
+ * as well as utility methods which look up factories on the basis of language name, file extension
+ * and mime type.
+ * <p>
+ * The <code>Bindings</code> of key/value pairs, referred to as the "Global Scope"  maintained
+ * by the manager is available to all instances of <code>ScriptEngine</code> created
+ * by the <code>ScriptEngineManager</code>.  The values in the <code>Bindings</code> are
+ * generally exposed in all scripts.
+ *
+ * @author Mike Grogan
+ * @author A. Sundararajan
+ * @since 1.6
+ */
+public class ScriptEngineManagerRedux  {
+    private static final boolean DEBUG = false;
+    /**
+     * The effect of calling this constructor is the same as calling
+     * <code>ScriptEngineManager(Thread.currentThread().getContextClassLoader())</code>.
+     *
+     * @see java.lang.Thread#getContextClassLoader
+     */
+    public ScriptEngineManagerRedux() {
+        ClassLoader ctxtLoader = Thread.currentThread().getContextClassLoader();
+        init(ctxtLoader);
+    }
+
+    /**
+     * This constructor loads the implementations of
+     * <code>ScriptEngineFactory</code> visible to the given
+     * <code>ClassLoader</code> using the service provider mechanism.<br><br>
+     * If loader is <code>null</code>, the script engine factories that are
+     * bundled with the platform are loaded. <br>
+     *
+     * @param loader ClassLoader used to discover script engine factories.
+     */
+    public ScriptEngineManagerRedux(ClassLoader loader) {
+        init(loader);
+    }
+
+    private void init(final ClassLoader loader) {
+        globalScope = new SimpleBindings();
+        engineSpis = new TreeSet<ScriptEngineFactory>(Comparator.comparing(
+                ScriptEngineFactory::getEngineName,
+                Comparator.nullsLast(Comparator.naturalOrder()))
+        );
+        nameAssociations = new HashMap<String, ScriptEngineFactory>();
+        extensionAssociations = new HashMap<String, ScriptEngineFactory>();
+        mimeTypeAssociations = new HashMap<String, ScriptEngineFactory>();
+        initEngines(loader);
+    }
+
+    private ServiceLoader<ScriptEngineFactory> getServiceLoader(final ClassLoader loader) {
+        if (loader != null) {
+            return ServiceLoader.load(ScriptEngineFactory.class, loader);
+        } else {
+            return ServiceLoader.loadInstalled(ScriptEngineFactory.class);
+        }
+    }
+
+    private void initEngines(final ClassLoader loader) {
+        Iterator<ScriptEngineFactory> itr = null;
+        try {
+            ServiceLoader<ScriptEngineFactory> sl = AccessController.doPrivileged(
+                    new PrivilegedAction<ServiceLoader<ScriptEngineFactory>>() {
+                        @Override
+                        public ServiceLoader<ScriptEngineFactory> run() {
+                            return getServiceLoader(loader);
+                        }
+                    });
+
+            itr = sl.iterator();
+        } catch (ServiceConfigurationError err) {
+            // } catch (Exception err) {
+            System.err.println("Can't find ScriptEngineFactory providers: " +
+                    err.getMessage());
+            if (DEBUG) {
+                err.printStackTrace();
+            }
+            // do not throw any exception here. user may want to
+            // manage his/her own factories using this manager
+            // by explicit registratation (by registerXXX) methods.
+            return;
+        }
+
+        try {
+            while (itr.hasNext()) {
+                try {
+                    ScriptEngineFactory fact = itr.next();
+                    engineSpis.add(fact);
+                } catch (ServiceConfigurationError err) {
+                    //   } catch (Exception err) {
+                    System.err.println("ScriptEngineManager providers.next(): "
+                            + err.getMessage());
+                    if (DEBUG) {
+                        err.printStackTrace();
+                    }
+                    // one factory failed, but check other factories...
+                    continue;
+                }
+            }
+        } catch (ServiceConfigurationError err) {
+            //    } catch (Exception err) {
+            System.err.println("ScriptEngineManager providers.hasNext(): "
+                    + err.getMessage());
+            if (DEBUG) {
+                err.printStackTrace();
+            }
+            // do not throw any exception here. user may want to
+            // manage his/her own factories using this manager
+            // by explicit registratation (by registerXXX) methods.
+            return;
+        }
+    }
+
+    /**
+     * <code>setBindings</code> stores the specified <code>Bindings</code>
+     * in the <code>globalScope</code> field. ScriptEngineManager sets this
+     * <code>Bindings</code> as global bindings for <code>ScriptEngine</code>
+     * objects created by it.
+     *
+     * @param bindings The specified <code>Bindings</code>
+     * @throws IllegalArgumentException if bindings is null.
+     */
+    public void setBindings(Bindings bindings) {
+        if (bindings == null) {
+            throw new IllegalArgumentException("Global scope cannot be null.");
+        }
+
+        globalScope = bindings;
+    }
+
+    /**
+     * <code>getBindings</code> returns the value of the <code>globalScope</code> field.
+     * ScriptEngineManager sets this <code>Bindings</code> as global bindings for
+     * <code>ScriptEngine</code> objects created by it.
+     *
+     * @return The globalScope field.
+     */
+    public Bindings getBindings() {
+        return globalScope;
+    }
+
+    /**
+     * Sets the specified key/value pair in the Global Scope.
+     * @param key Key to set
+     * @param value Value to set.
+     * @throws NullPointerException if key is null.
+     * @throws IllegalArgumentException if key is empty string.
+     */
+    public void put(String key, Object value) {
+        globalScope.put(key, value);
+    }
+
+    /**
+     * Gets the value for the specified key in the Global Scope
+     * @param key The key whose value is to be returned.
+     * @return The value for the specified key.
+     */
+    public Object get(String key) {
+        return globalScope.get(key);
+    }
+
+    /**
+     * Looks up and creates a <code>ScriptEngine</code> for a given  name.
+     * The algorithm first searches for a <code>ScriptEngineFactory</code> that has been
+     * registered as a handler for the specified name using the <code>registerEngineName</code>
+     * method.
+     * <br><br> If one is not found, it searches the set of <code>ScriptEngineFactory</code> instances
+     * stored by the constructor for one with the specified name.  If a <code>ScriptEngineFactory</code>
+     * is found by either method, it is used to create instance of <code>ScriptEngine</code>.
+     * @param shortName The short name of the <code>ScriptEngine</code> implementation.
+     * returned by the <code>getNames</code> method of its <code>ScriptEngineFactory</code>.
+     * @return A <code>ScriptEngine</code> created by the factory located in the search.  Returns null
+     * if no such factory was found.  The <code>ScriptEngineManager</code> sets its own <code>globalScope</code>
+     * <code>Bindings</code> as the <code>GLOBAL_SCOPE</code> <code>Bindings</code> of the newly
+     * created <code>ScriptEngine</code>.
+     * @throws NullPointerException if shortName is null.
+     */
+    public ScriptEngine getEngineByName(String shortName) {
+        if (shortName == null) throw new NullPointerException();
+        //look for registered name first
+        Object obj;
+        if (null != (obj = nameAssociations.get(shortName))) {
+            ScriptEngineFactory spi = (ScriptEngineFactory)obj;
+            try {
+                ScriptEngine engine = spi.getScriptEngine();
+                engine.setBindings(getBindings(), ScriptContext.GLOBAL_SCOPE);
+                return engine;
+            } catch (Exception exp) {
+                if (DEBUG) exp.printStackTrace();
+            }
+        }
+
+        for (ScriptEngineFactory spi : engineSpis) {
+            List<String> names = null;
+            try {
+                names = spi.getNames();
+            } catch (Exception exp) {
+                if (DEBUG) exp.printStackTrace();
+            }
+
+            if (names != null) {
+                for (String name : names) {
+                    if (shortName.equals(name)) {
+                        try {
+                            ScriptEngine engine = spi.getScriptEngine();
+                            engine.setBindings(getBindings(), ScriptContext.GLOBAL_SCOPE);
+                            return engine;
+                        } catch (Exception exp) {
+                            if (DEBUG) exp.printStackTrace();
+                        }
+                    }
+                }
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * Look up and create a <code>ScriptEngine</code> for a given extension.  The algorithm
+     * used by <code>getEngineByName</code> is used except that the search starts
+     * by looking for a <code>ScriptEngineFactory</code> registered to handle the
+     * given extension using <code>registerEngineExtension</code>.
+     * @param extension The given extension
+     * @return The engine to handle scripts with this extension.  Returns <code>null</code>
+     * if not found.
+     * @throws NullPointerException if extension is null.
+     */
+    public ScriptEngine getEngineByExtension(String extension) {
+        if (extension == null) throw new NullPointerException();
+        //look for registered extension first
+        Object obj;
+        if (null != (obj = extensionAssociations.get(extension))) {
+            ScriptEngineFactory spi = (ScriptEngineFactory)obj;
+            try {
+                ScriptEngine engine = spi.getScriptEngine();
+                engine.setBindings(getBindings(), ScriptContext.GLOBAL_SCOPE);
+                return engine;
+            } catch (Exception exp) {
+                if (DEBUG) exp.printStackTrace();
+            }
+        }
+
+        for (ScriptEngineFactory spi : engineSpis) {
+            List<String> exts = null;
+            try {
+                exts = spi.getExtensions();
+            } catch (Exception exp) {
+                if (DEBUG) exp.printStackTrace();
+            }
+            if (exts == null) continue;
+            for (String ext : exts) {
+                if (extension.equals(ext)) {
+                    try {
+                        ScriptEngine engine = spi.getScriptEngine();
+                        engine.setBindings(getBindings(), ScriptContext.GLOBAL_SCOPE);
+                        return engine;
+                    } catch (Exception exp) {
+                        if (DEBUG) exp.printStackTrace();
+                    }
+                }
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Look up and create a <code>ScriptEngine</code> for a given mime type.  The algorithm
+     * used by <code>getEngineByName</code> is used except that the search starts
+     * by looking for a <code>ScriptEngineFactory</code> registered to handle the
+     * given mime type using <code>registerEngineMimeType</code>.
+     * @param mimeType The given mime type
+     * @return The engine to handle scripts with this mime type.  Returns <code>null</code>
+     * if not found.
+     * @throws NullPointerException if mimeType is null.
+     */
+    public ScriptEngine getEngineByMimeType(String mimeType) {
+        if (mimeType == null) throw new NullPointerException();
+        //look for registered types first
+        Object obj;
+        if (null != (obj = mimeTypeAssociations.get(mimeType))) {
+            ScriptEngineFactory spi = (ScriptEngineFactory)obj;
+            try {
+                ScriptEngine engine = spi.getScriptEngine();
+                engine.setBindings(getBindings(), ScriptContext.GLOBAL_SCOPE);
+                return engine;
+            } catch (Exception exp) {
+                if (DEBUG) exp.printStackTrace();
+            }
+        }
+
+        for (ScriptEngineFactory spi : engineSpis) {
+            List<String> types = null;
+            try {
+                types = spi.getMimeTypes();
+            } catch (Exception exp) {
+                if (DEBUG) exp.printStackTrace();
+            }
+            if (types == null) continue;
+            for (String type : types) {
+                if (mimeType.equals(type)) {
+                    try {
+                        ScriptEngine engine = spi.getScriptEngine();
+                        engine.setBindings(getBindings(), ScriptContext.GLOBAL_SCOPE);
+                        return engine;
+                    } catch (Exception exp) {
+                        if (DEBUG) exp.printStackTrace();
+                    }
+                }
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Returns a list whose elements are instances of all the <code>ScriptEngineFactory</code> classes
+     * found by the discovery mechanism.
+     * @return List of all discovered <code>ScriptEngineFactory</code>s.
+     */
+    public List<ScriptEngineFactory> getEngineFactories() {
+        List<ScriptEngineFactory> res = new ArrayList<ScriptEngineFactory>(engineSpis.size());
+        for (ScriptEngineFactory spi : engineSpis) {
+            res.add(spi);
+        }
+        return Collections.unmodifiableList(res);
+    }
+
+    /**
+     * Registers a <code>ScriptEngineFactory</code> to handle a language
+     * name.  Overrides any such association found using the Discovery mechanism.
+     * @param name The name to be associated with the <code>ScriptEngineFactory</code>.
+     * @param factory The class to associate with the given name.
+     * @throws NullPointerException if any of the parameters is null.
+     */
+    public void registerEngineName(String name, ScriptEngineFactory factory) {
+        if (name == null || factory == null) throw new NullPointerException();
+        nameAssociations.put(name, factory);
+    }
+
+    /**
+     * Registers a <code>ScriptEngineFactory</code> to handle a mime type.
+     * Overrides any such association found using the Discovery mechanism.
+     *
+     * @param type The mime type  to be associated with the
+     * <code>ScriptEngineFactory</code>.
+     *
+     * @param factory The class to associate with the given mime type.
+     * @throws NullPointerException if any of the parameters is null.
+     */
+    public void registerEngineMimeType(String type, ScriptEngineFactory factory) {
+        if (type == null || factory == null) throw new NullPointerException();
+        mimeTypeAssociations.put(type, factory);
+    }
+
+    /**
+     * Registers a <code>ScriptEngineFactory</code> to handle an extension.
+     * Overrides any such association found using the Discovery mechanism.
+     *
+     * @param extension The extension type  to be associated with the
+     * <code>ScriptEngineFactory</code>.
+     * @param factory The class to associate with the given extension.
+     * @throws NullPointerException if any of the parameters is null.
+     */
+    public void registerEngineExtension(String extension, ScriptEngineFactory factory) {
+        if (extension == null || factory == null) throw new NullPointerException();
+        extensionAssociations.put(extension, factory);
+    }
+
+    /** Set of script engine factories discovered. */
+    private TreeSet<ScriptEngineFactory> engineSpis;
+
+    /** Map of engine name to script engine factory. */
+    private HashMap<String, ScriptEngineFactory> nameAssociations;
+
+    /** Map of script file extension to script engine factory. */
+    private HashMap<String, ScriptEngineFactory> extensionAssociations;
+
+    /** Map of script MIME type to script engine factory. */
+    private HashMap<String, ScriptEngineFactory> mimeTypeAssociations;
+
+    /** Global bindings associated with script engines created by this manager. */
+    private Bindings globalScope;
+}

core/src/net/sf/openrocket/simulation/extension/impl/ScriptingExtension.java

@@ -2,7 +2,6 @@ package net.sf.openrocket.simulation.extension.impl;
 
 import javax.script.Invocable;
 import javax.script.ScriptEngine;
-import javax.script.ScriptEngineManager;
 import javax.script.ScriptException;
 
 import net.sf.openrocket.aerodynamics.Warning;
@@ -91,8 +90,7 @@ public class ScriptingExtension extends AbstractSimulationExtension {
 	
 	
 	SimulationListener getListener() throws SimulationException {
-		ScriptEngineManager manager = new ScriptEngineManager();
-		ScriptEngine engine = manager.getEngineByName(getLanguage());
+		ScriptEngine engine = util.getEngineByName(getLanguage());
 		if (engine == null) {
 			throw new SimulationException("Your JRE does not support the scripting language '" + getLanguage() + "'");
 		}

core/src/net/sf/openrocket/simulation/extension/impl/ScriptingUtil.java

@@ -10,8 +10,8 @@ import java.util.prefs.BackingStoreException;
 
 import javax.script.ScriptEngine;
 import javax.script.ScriptEngineFactory;
-import javax.script.ScriptEngineManager;
 
+import net.sf.openrocket.scripting.ScriptEngineManagerRedux;
 import net.sf.openrocket.startup.Preferences;
 import net.sf.openrocket.util.ArrayList;
 import net.sf.openrocket.util.BugException;
@@ -22,22 +22,28 @@ import com.google.inject.Inject;
  * Utility class used by the scripting extension and its configurator.
  */
 public class ScriptingUtil {
-	
 	static final String NODE_ID = ScriptingExtension.class.getCanonicalName();
 	
-	private static final List<String> DEFAULT_TRUSTED_HASHES = Arrays.asList(
+	private static final List<String> DEFAULT_TRUSTED_HASHES = List.of(
 			// Roll control script in roll control example file:
 			"SHA-256:9bf364ce4d4a75f09b29178bf9d6872b232084f73dae20dc7b5b073e54e95a42"
-			);
+	);
 	
 	/** The name to be chosen from a list of alternatives.  If not found, will use the default name. */
-	private static final List<String> PREFERRED_LANGUAGE_NAMES = Arrays.asList("JavaScript");
+	private static final List<String> PREFERRED_LANGUAGE_NAMES = List.of("JavaScript");
 	
 	@Inject
 	Preferences prefs;
 	
-	
-	
+	private static ScriptEngineManagerRedux manager;
+
+	public ScriptingUtil() {
+		if (manager == null) {
+			// using the ScriptEngineManger from javax.script package pulls in the sun.misc.ServiceConfigurationError 
+			// which is removed in Java 9+ which causes a ClassNotFoundException to be thrown.
+			manager = new ScriptEngineManagerRedux();
+		}
+	}
 	
 	/**
 	 * Return the preferred internal language name based on a script language name.
@@ -48,26 +54,26 @@ public class ScriptingUtil {
 		if (language == null) {
 			return null;
 		}
-		
-		ScriptEngineManager manager = new ScriptEngineManager();
+
 		ScriptEngine engine = manager.getEngineByName(language);
 		if (engine == null) {
 			return null;
 		}
 		return getLanguage(engine.getFactory());
 	}
-	
-	
+
+	public ScriptEngine getEngineByName(String shortName) {
+		return manager.getEngineByName(shortName);
+	}
+
 	public List<String> getLanguages() {
-		List<String> langs = new ArrayList<String>();
-		ScriptEngineManager manager = new ScriptEngineManager();
+		List<String> langs = new ArrayList<>();
 		for (ScriptEngineFactory factory : manager.getEngineFactories()) {
 			langs.add(getLanguage(factory));
 		}
 		return langs;
 	}
 	
-	
 	private String getLanguage(ScriptEngineFactory factory) {
 		for (String name : factory.getNames()) {
 			if (PREFERRED_LANGUAGE_NAMES.contains(name)) {
@@ -78,8 +84,6 @@ public class ScriptingUtil {
 		return factory.getLanguageName();
 	}
 	
-	
-	
 	/**
 	 * Test whether the user has indicated this script to be trusted,
 	 * or if it is an internally trusted script.
@@ -123,7 +127,6 @@ public class ScriptingUtil {
 		}
 	}
 	
-	
 	static String normalize(String script) {
 		return script.replaceAll("\r", "").trim();
 	}
@@ -132,10 +135,8 @@ public class ScriptingUtil {
 		/*
 		 * NOTE:  Hash length must be max 80 chars, the max length of a key in a Properties object.
 		 */
-		
 		String output;
 		MessageDigest digest;
-		
 		try {
 			digest = MessageDigest.getInstance("SHA-256");
 			digest.update(language.getBytes(StandardCharsets.UTF_8));
@@ -152,5 +153,4 @@ public class ScriptingUtil {
 
 		return digest.getAlgorithm() + ":" + output;
 	}
-	
 }

swing/build.xml

@@ -99,6 +99,11 @@
 			<zipfileset src="${core.dir}/lib/guice-4.2.3-no_aop.jar" />
 			<zipfileset src="${core.dir}/lib/aopalliance.jar"/>
 			<zipfileset src="${core.dir}/lib/commonmark-0.19.0.jar"/>
+			<zipfileset src="${core.dir}/lib/icu4j-71.1.jar"/>
+			<zipfileset src="${core.dir}/lib/js-22.1.0.1.jar"/>
+			<zipfileset src="${core.dir}/lib/graal-sdk-22.1.0.1.jar"/>
+			<zipfileset src="${core.dir}/lib/js-scriptengine-22.1.0.1.jar"/>
+			<zipfileset src="${core.dir}/lib/truffle-api-22.1.0.1.jar"/>
 			<zipfileset src="${core.dir}/lib/script-api-1.0.jar"/>
 			<zipfileset src="${lib.dir}/iText-5.0.2.jar"/>
 			<zipfileset src="${core.dir}/lib/istack-commons-runtime.jar"/>

swing/src/net/sf/openrocket/simulation/extension/impl/ScriptingConfigurator.java

@@ -8,7 +8,6 @@ import java.awt.event.FocusListener;
 import java.util.Set;
 
 import javax.script.ScriptEngine;
-import javax.script.ScriptEngineManager;
 import javax.swing.JButton;
 import javax.swing.JCheckBox;
 import javax.swing.JComboBox;
@@ -33,7 +32,6 @@ import com.google.inject.Inject;
 
 @Plugin
 public class ScriptingConfigurator extends AbstractSwingSimulationExtensionConfigurator<ScriptingExtension> {
-	
 	@Inject
 	private ScriptingUtil util;
 	
@@ -66,7 +64,6 @@ public class ScriptingConfigurator extends AbstractSwingSimulationExtensionConfi
 		});
 		panel.add(languageSelector, "wrap para");
 		
-		
 		text = new RSyntaxTextArea(extension.getScript(), 20, 80);
 		text.setSyntaxEditingStyle(SyntaxConstants.SYNTAX_STYLE_JAVASCRIPT);
 		text.setCodeFoldingEnabled(true);
@@ -91,7 +88,6 @@ public class ScriptingConfigurator extends AbstractSwingSimulationExtensionConfi
 		RTextScrollPane scroll = new RTextScrollPane(text);
 		panel.add(scroll, "spanx, grow, wrap para");
 		
-		
 		BooleanModel enabled = new BooleanModel(extension, "Enabled");
 		JCheckBox check = new JCheckBox(enabled);
 		check.setText(trans.get("SimulationExtension.scripting.text.enabled"));
@@ -116,7 +112,6 @@ public class ScriptingConfigurator extends AbstractSwingSimulationExtensionConfi
 		});
 		panel.add(button, "wrap rel");
 		
-		
 		StyledLabel label = new StyledLabel(trans.get("SimulationExtension.scripting.text.trusted.msg"), -1, Style.ITALIC);
 		panel.add(label);
 		
@@ -130,7 +125,6 @@ public class ScriptingConfigurator extends AbstractSwingSimulationExtensionConfi
 		util.setTrustedScript(extension.getLanguage(), extension.getScript(), trusted.isSelected());
 	}
 	
-	
 	private void setLanguage(String language) {
 		if (language == null) {
 			language = "";
@@ -144,8 +138,7 @@ public class ScriptingConfigurator extends AbstractSwingSimulationExtensionConfi
 	}
 	
 	private String findSyntaxLanguage(String language) {
-		ScriptEngineManager manager = new ScriptEngineManager();
-		ScriptEngine engine = manager.getEngineByName(language);
+		ScriptEngine engine = util.getEngineByName(language);
 		
 		if (engine != null) {
 			Set<String> supported = TokenMakerFactory.getDefaultInstance().keySet();
@@ -163,5 +156,4 @@ public class ScriptingConfigurator extends AbstractSwingSimulationExtensionConfi
 		
 		return SyntaxConstants.SYNTAX_STYLE_NONE;
 	}
-	
 }

swing/src/net/sf/openrocket/utils/Scripting.java

@@ -5,16 +5,17 @@ import java.util.Collections;
 import java.util.List;
 
 import javax.script.ScriptEngineFactory;
-import javax.script.ScriptEngineManager;
 
 import org.fife.ui.rsyntaxtextarea.TokenMakerFactory;
 
+import net.sf.openrocket.scripting.ScriptEngineManagerRedux;
+
 public class Scripting {
 	
 	public static void main(String[] args) {
 		System.out.println("Scripting APIs:");
 		
-		ScriptEngineManager manager = new ScriptEngineManager();
+		ScriptEngineManagerRedux manager = new ScriptEngineManagerRedux();
 		for (ScriptEngineFactory factory : manager.getEngineFactories()) {
 			System.out.println("  engineName=" + factory.getEngineName() +
 					" engineVersion=" + factory.getEngineVersion() +