LUCENE-4252: null these out for GC to close ram leak

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1365450 13f79535-47bb-0310-9956-ffa450edef68

lucene/analysis/common/src/test/org/apache/lucene/analysis/hunspell/HunspellStemFilterTest.java

@@ -30,6 +30,7 @@ import org.apache.lucene.analysis.Tokenizer;
 import org.apache.lucene.analysis.core.KeywordTokenizer;
 import org.apache.lucene.analysis.miscellaneous.KeywordMarkerFilter;
 import org.apache.lucene.analysis.util.CharArraySet;
+import org.junit.AfterClass;
 import org.junit.BeforeClass;
 
 public class HunspellStemFilterTest  extends BaseTokenStreamTestCase {
@@ -39,6 +40,10 @@ public class HunspellStemFilterTest  extends BaseTokenStreamTestCase {
   public static void beforeClass() throws IOException, ParseException {
     DICTIONARY = createDict(true);
   }
+  @AfterClass
+  public static void afterClass() {
+    DICTIONARY = null;
+  }
   public static HunspellDictionary createDict(boolean ignoreCase) throws IOException, ParseException {
     InputStream affixStream = HunspellStemmerTest.class.getResourceAsStream("test.aff");
     InputStream dictStream = HunspellStemmerTest.class.getResourceAsStream("test.dic");

lucene/analysis/common/src/test/org/apache/lucene/analysis/hunspell/HunspellStemmerTest.java

@@ -19,6 +19,7 @@ package org.apache.lucene.analysis.hunspell;
 
 import org.apache.lucene.util.LuceneTestCase;
 import org.apache.lucene.util.Version;
+import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.Test;
 
@@ -37,6 +38,11 @@ public class HunspellStemmerTest extends LuceneTestCase {
   public static void beforeClass() throws IOException, ParseException {
     createStemmer(true);
   }
+  
+  @AfterClass
+  public static void afterClass() {
+    stemmer = null;
+  }
 
   @Test
   public void testStem_simpleSuffix() {

lucene/core/src/test/org/apache/lucene/search/spans/TestBasics.java

@@ -96,7 +96,7 @@ public class TestBasics extends LuceneTestCase {
     }
   }
   
-  static final Analyzer simplePayloadAnalyzer = new Analyzer() {
+  static Analyzer simplePayloadAnalyzer = new Analyzer() {
 
     @Override
     public TokenStreamComponents createComponents(String fieldName, Reader reader) {
@@ -130,6 +130,7 @@ public class TestBasics extends LuceneTestCase {
     searcher = null;
     reader = null;
     directory = null;
+    simplePayloadAnalyzer = null;
   }
 
   @Test

lucene/misc/src/test/org/apache/lucene/misc/TestHighFreqTerms.java

@@ -56,6 +56,7 @@ public class TestHighFreqTerms extends LuceneTestCase {
     dir.close();
     dir = null;
     reader = null;
+    writer = null;
   }
 /******************** Tests for getHighFreqTerms **********************************/
   

solr/core/src/test/org/apache/solr/cloud/TestMultiCoreConfBootstrap.java

@@ -48,7 +48,8 @@ public class TestMultiCoreConfBootstrap extends SolrTestCaseJ4 {
   
   @AfterClass
   public static void afterClass() {
-
+    zkServer = null;
+    zkDir = null;
   }
   
   @Override

solr/core/src/test/org/apache/solr/search/TestValueSourceCache.java

@@ -21,6 +21,7 @@ import org.apache.lucene.queryparser.classic.ParseException;
 import org.apache.lucene.search.Query;
 import org.apache.lucene.search.QueryUtils;
 import org.apache.solr.SolrTestCaseJ4;
+import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.Test;
 
@@ -34,6 +35,11 @@ public class TestValueSourceCache extends SolrTestCaseJ4 {
   }
 
   static QParser _func;
+  
+  @AfterClass
+  public static void afterClass() throws Exception {
+    _func = null;
+  }
 
   Query getQuery(String query) throws ParseException {
     _func.setString(query);