Index: modules/analysis/common/src/test/org/apache/lucene/analysis/de/TestGermanStemFilter.java
===================================================================
--- modules/analysis/common/src/test/org/apache/lucene/analysis/de/TestGermanStemFilter.java	(revision 1096178)
+++ modules/analysis/common/src/test/org/apache/lucene/analysis/de/TestGermanStemFilter.java	(working copy)
@@ -26,7 +26,6 @@
 import org.apache.lucene.analysis.core.KeywordTokenizer;
 import org.apache.lucene.analysis.core.LowerCaseFilter;
 import org.apache.lucene.analysis.util.ReusableAnalyzerBase;
-import org.junit.Ignore;
 
 import static org.apache.lucene.analysis.util.VocabularyAssert.*;
 
@@ -54,7 +53,6 @@
   }
   
   /** blast some random strings through the analyzer */
-  @Ignore("bugs!")
   public void testRandomStrings() throws Exception {
     checkRandomData(random, analyzer, 10000*RANDOM_MULTIPLIER);
   }
Index: modules/analysis/common/src/java/org/apache/lucene/analysis/de/GermanStemmer.java
===================================================================
--- modules/analysis/common/src/java/org/apache/lucene/analysis/de/GermanStemmer.java	(revision 1095935)
+++ modules/analysis/common/src/java/org/apache/lucene/analysis/de/GermanStemmer.java	(working copy)
@@ -132,7 +132,8 @@
         strip( buffer );
       }
       // Additional step for irregular plural nouns like "Matrizen -> Matrix".
-      if ( buffer.charAt( buffer.length() - 1 ) == ( 'z' ) ) {
+      // NOTE: this length constraint is probably not a great value, its just to prevent AIOOBE on empty terms
+      if ( buffer.length() > 0 && buffer.charAt( buffer.length() - 1 ) == ( 'z' ) ) {
         buffer.setCharAt( buffer.length() - 1, 'x' );
       }
     }