From 645d2083bf79d334bf3c7fb141526ede33b86c30 Mon Sep 17 00:00:00 2001
From: Dominik Stadler <centic@apache.org>
Date: Mon, 22 Dec 2014 12:38:44 +0000
Subject: [PATCH] Bug 56550: Defer the initialization of the _classes to when
 it is actually needed to allow IBM JDK to at least load the class

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1647302 13f79535-47bb-0310-9956-ffa450edef68
---
 .../java/org/apache/poi/util/OOXMLLite.java   | 21 ++++++++++---------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/src/ooxml/java/org/apache/poi/util/OOXMLLite.java b/src/ooxml/java/org/apache/poi/util/OOXMLLite.java
index 64920225a..4cbfdbdf3 100644
--- a/src/ooxml/java/org/apache/poi/util/OOXMLLite.java
+++ b/src/ooxml/java/org/apache/poi/util/OOXMLLite.java
@@ -47,16 +47,7 @@ import org.junit.runner.Result;
  * @author Yegor Kozlov
  */
 public final class OOXMLLite {
-
-    private static final Field _classes;
-    static {
-        try {
-            _classes = ClassLoader.class.getDeclaredField("classes");
-            _classes.setAccessible(true);
-        } catch (Exception e) {
-            throw new RuntimeException(e);
-        }
-    }
+    private static Field _classes;
 
     /**
      * Destination directory to copy filtered classes
@@ -206,6 +197,16 @@ public final class OOXMLLite {
      */
     @SuppressWarnings("unchecked")
     private static Map<String, Class<?>> getLoadedClasses(String ptrn) {
+        // make the field accessible, we defer this from static initialization to here to 
+        // allow JDKs which do not have this field (e.g. IBM JDK) to at least load the class
+        // without failing, see https://issues.apache.org/bugzilla/show_bug.cgi?id=56550
+        try {
+            _classes = ClassLoader.class.getDeclaredField("classes");
+            _classes.setAccessible(true);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+
         ClassLoader appLoader = ClassLoader.getSystemClassLoader();
         try {
             Vector<Class<?>> classes = (Vector<Class<?>>) _classes.get(appLoader);