8144979: Context.fromClass should catch exception from Class.getClassLoader call

Reviewed-by: attila, mhaupt

nashorn/samples/dynalink/README

@@ -1,6 +1,5 @@
-In addition to samples for Nashorn javascript engine, this directory contains
+This directory contains samples for Dynalink API (http://openjdk.java.net/jeps/276).
-samples for Dynalink API (http://openjdk.java.net/jeps/276) as well. Dynalink
+These samples require a jar file to be built and such jars be placed in the
-linker samples require a jar file to be built and such jars be placed in the
 classpath of the jjs tool. Linker samples are named with the naming pattern
 "xyz_linker.js". These scripts build dynalink linker jar from java code and exec
 another jjs process with appropriate classpath set.

nashorn/samples/dynalink/array_stream.js

@@ -44,11 +44,11 @@ var is = Java.to([3, 56, 4, 23], "int[]").stream
 print(is.map(function(x) x*x).sum())
 
 // DoubleStream
-var arr = [];
+var DoubleArray = Java.type("double[]")
-for (var i = 0; i < 100; i++)
+var arr = new DoubleArray(100)
-    arr.push(Math.random())
+for (var i = 0; i < arr.length; i++)
+    arr[i] = Math.random()
 
-var ds = Java.to(arr, "double[]").stream
+print(arr.stream.summaryStatistics())
-print(ds.summaryStatistics())
 
 

nashorn/samples/dynalink/array_stream_linker.js

@@ -37,7 +37,7 @@
 $EXEC.throwOnError=true
 
 // compile ArrayStreamLinkerExporter
-`javac -cp ../dist/nashorn.jar ArrayStreamLinkerExporter.java`
+`javac -cp ../../dist/nashorn.jar ArrayStreamLinkerExporter.java`
 
 // make a jar file out of pluggable linker
 `jar cvf array_stream_linker.jar ArrayStreamLinkerExporter*.class META-INF/`

nashorn/samples/dynalink/buffer_indexing_linker.js

@@ -37,7 +37,7 @@
 $EXEC.throwOnError=true
 
 // compile BufferIndexingLinkerExporter
-`javac -cp ../dist/nashorn.jar BufferIndexingLinkerExporter.java`
+`javac -cp ../../dist/nashorn.jar BufferIndexingLinkerExporter.java`
 
 // make a jar file out of pluggable linker
 `jar cvf buffer_indexing_linker.jar BufferIndexingLinkerExporter*.class META-INF/`

nashorn/samples/dynalink/dom_linker.js

@@ -37,7 +37,7 @@
 $EXEC.throwOnError=true
 
 // compile DOMLinkerExporter
-`javac -cp ../dist/nashorn.jar DOMLinkerExporter.java`
+`javac -cp ../../dist/nashorn.jar DOMLinkerExporter.java`
 
 // make a jar file out of pluggable linker
 `jar cvf dom_linker.jar DOMLinkerExporter*.class META-INF/`

nashorn/samples/dynalink/missing_method_linker.js

@@ -37,7 +37,7 @@
 $EXEC.throwOnError=true
 
 // compile MissingMethodLinkerExporter
-`javac -cp ../dist/nashorn.jar MissingMethodLinkerExporter.java MissingMethodHandler.java MissingMethodExample.java`
+`javac -cp ../../dist/nashorn.jar MissingMethodLinkerExporter.java MissingMethodHandler.java MissingMethodExample.java`
 
 // make a jar file out of pluggable linker
 `jar cvf missing_method_linker.jar MissingMethod*.class META-INF/`

nashorn/samples/dynalink/underscore_linker.js

@@ -37,7 +37,7 @@
 $EXEC.throwOnError=true
 
 // compile UnderscoreNameLinkerExporter
-`javac -cp ../dist/nashorn.jar UnderscoreNameLinkerExporter.java`
+`javac -cp ../../dist/nashorn.jar UnderscoreNameLinkerExporter.java`
 
 // make a jar file out of pluggable linker
 `jar cvf underscore_linker.jar UnderscoreNameLinkerExporter*.class META-INF/`

nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/Context.java

@@ -1300,7 +1300,16 @@ public final class Context {
      * @return context
      */
     static Context fromClass(final Class<?> clazz) {
-        final ClassLoader loader = clazz.getClassLoader();
+        ClassLoader loader = null;
+        try {
+            loader = clazz.getClassLoader();
+        } catch (SecurityException ignored) {
+            // This could fail because of anonymous classes being used.
+            // Accessing loader of anonymous class fails (for extension
+            // loader class too?). In any case, for us fetching Context
+            // from class loader is just an optimization. We can always
+            // get Context from thread local storage (below).
+        }
 
         if (loader instanceof ScriptLoader) {
             return ((ScriptLoader)loader).getContext();