[RocksJava] Fix cleanup in tests

java/src/test/java/org/rocksdb/AbstractComparatorTest.java

@@ -78,6 +78,7 @@ public abstract class AbstractComparatorTest {
         lastKey = thisKey;
         count++;
       }
+      it.dispose();
       db.close();
 
       assertThat(count).isEqualTo(ITERATIONS);
@@ -162,6 +163,8 @@ public abstract class AbstractComparatorTest {
         lastKey = thisKey;
         count++;
       }
+
+      it.dispose();
       for (ColumnFamilyHandle handle : cfHandles) {
         handle.dispose();
       }

java/src/test/java/org/rocksdb/ColumnFamilyTest.java

@@ -56,7 +56,7 @@ public class ColumnFamilyTest {
   public void defaultColumnFamily() throws RocksDBException {
     RocksDB db = null;
     Options options = null;
-    ColumnFamilyHandle cfh = null;
+    ColumnFamilyHandle cfh;
     try {
       options = new Options().setCreateIfMissing(true);
 
@@ -95,7 +95,7 @@ public class ColumnFamilyTest {
       db = RocksDB.open(options, dbFolder.getRoot().getAbsolutePath());
       columnFamilyHandle = db.createColumnFamily(
           new ColumnFamilyDescriptor("new_cf".getBytes(), new ColumnFamilyOptions()));
-      db.close();
+
       List<byte[]> columnFamilyNames;
       columnFamilyNames = RocksDB.listColumnFamilies(options, dbFolder.getRoot().getAbsolutePath());
       assertThat(columnFamilyNames).isNotNull();
@@ -464,6 +464,7 @@ public class ColumnFamilyTest {
         new ArrayList<>();
     List<ColumnFamilyHandle> columnFamilyHandleList =
         new ArrayList<>();
+    List<RocksIterator> iterators = null;
     try {
       options = new DBOptions();
       options.setCreateIfMissing(true);
@@ -474,8 +475,7 @@ public class ColumnFamilyTest {
 
       db = RocksDB.open(options, dbFolder.getRoot().getAbsolutePath(),
           cfNames, columnFamilyHandleList);
-      List<RocksIterator> iterators =
-          db.newIterators(columnFamilyHandleList);
+      iterators = db.newIterators(columnFamilyHandleList);
       assertThat(iterators.size()).isEqualTo(2);
       RocksIterator iter = iterators.get(0);
       iter.seekToFirst();
@@ -499,6 +499,11 @@ public class ColumnFamilyTest {
         iter.next();
       }
     } finally {
+      if (iterators != null) {
+        for (RocksIterator rocksIterator : iterators) {
+          rocksIterator.dispose();
+        }
+      }
       for (ColumnFamilyHandle columnFamilyHandle : columnFamilyHandleList) {
         columnFamilyHandle.dispose();
       }

java/src/test/java/org/rocksdb/RocksDBTest.java

@@ -473,7 +473,7 @@ public class RocksDBTest {
         db.put((String.valueOf(i)).getBytes(), b);
       }
       db.compactRange("0".getBytes(), "201".getBytes(),
-          true, 0, 0);
+          true, 0, -1);
     } finally {
       if (db != null) {
         db.close();
@@ -580,7 +580,7 @@ public class RocksDBTest {
             String.valueOf(i).getBytes(), b);
       }
       db.compactRange(columnFamilyHandles.get(1), "0".getBytes(),
-          "201".getBytes(), true, 0, 0);
+          "201".getBytes(), true, 0, -1);
     } finally {
       for (ColumnFamilyHandle handle : columnFamilyHandles) {
         handle.dispose();
@@ -729,6 +729,9 @@ public class RocksDBTest {
         }
       }
     } finally {
+      for (ColumnFamilyHandle handle : columnFamilyHandles) {
+        handle.dispose();
+      }
       if (db != null) {
         db.close();
       }

java/src/test/java/org/rocksdb/RocksIteratorTest.java

@@ -58,41 +58,9 @@ public class RocksIteratorTest {
       assertThat(iterator.value()).isEqualTo("value2".getBytes());
       iterator.status();
     } finally {
-      if (db != null) {
-        db.close();
-      }
-      if (options != null) {
-        options.dispose();
-      }
       if (iterator != null) {
         iterator.dispose();
       }
-    }
-  }
-
-  @Test
-  public void rocksIteratorGc()
-      throws RocksDBException {
-    RocksDB db = null;
-    Options options = null;
-    try {
-      options = new Options();
-      options.setCreateIfMissing(true)
-          .setCreateMissingColumnFamilies(true);
-      db = RocksDB.open(options,
-          dbFolder.getRoot().getAbsolutePath());
-      db.put("key".getBytes(), "value".getBytes());
-      db.newIterator();
-      db.newIterator();
-      RocksIterator iter3 = db.newIterator();
-      db.close();
-      db = null;
-      System.gc();
-      System.runFinalization();
-      iter3.dispose();
-      System.gc();
-      System.runFinalization();
-    } finally {
       if (db != null) {
         db.close();
       }