THRIFT-2122 NPE in TSSLTransportFactory.createClient when no truststore password is passed in custom SSL params

Client: Java
Patch: Venki Korukanti
diff --git a/lib/java/src/org/apache/thrift/transport/TSSLTransportFactory.java b/lib/java/src/org/apache/thrift/transport/TSSLTransportFactory.java
index 16d2fd1..e830bb9 100755
--- a/lib/java/src/org/apache/thrift/transport/TSSLTransportFactory.java
+++ b/lib/java/src/org/apache/thrift/transport/TSSLTransportFactory.java
@@ -183,7 +183,8 @@
         tmf = TrustManagerFactory.getInstance(params.trustManagerType);
         KeyStore ts = KeyStore.getInstance(params.trustStoreType);
         fin = new FileInputStream(params.trustStore);
-        ts.load(fin, params.trustPass.toCharArray());
+        ts.load(fin,
+          (params.trustPass != null ? params.trustPass.toCharArray() : null));
         tmf.init(ts);
       }
 
diff --git a/lib/java/test/org/apache/thrift/transport/TestTSSLTransportFactoryCustomClient1.java b/lib/java/test/org/apache/thrift/transport/TestTSSLTransportFactoryCustomClient1.java
new file mode 100644
index 0000000..da1659f
--- /dev/null
+++ b/lib/java/test/org/apache/thrift/transport/TestTSSLTransportFactoryCustomClient1.java
@@ -0,0 +1,35 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.thrift.transport;
+
+public class TestTSSLTransportFactoryCustomClient1 extends TestTSSLTransportFactory {
+
+  @Override
+  public TTransport getClientTransport(TTransport underlyingTransport)
+  throws Exception {
+    TSSLTransportFactory.TSSLTransportParameters params = new
+      TSSLTransportFactory.TSSLTransportParameters();
+
+    params.setTrustStore(System.getProperty("javax.net.ssl.trustStore"),
+      System.getProperty("javax.net.ssl.trustStorePassword"));
+
+    return TSSLTransportFactory.getClientSocket(HOST, PORT, 0/*timeout*/, params);
+  }
+}
diff --git a/lib/java/test/org/apache/thrift/transport/TestTSSLTransportFactoryCustomClient2.java b/lib/java/test/org/apache/thrift/transport/TestTSSLTransportFactoryCustomClient2.java
new file mode 100644
index 0000000..eaed460
--- /dev/null
+++ b/lib/java/test/org/apache/thrift/transport/TestTSSLTransportFactoryCustomClient2.java
@@ -0,0 +1,34 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.thrift.transport;
+
+public class TestTSSLTransportFactoryCustomClient2 extends TestTSSLTransportFactory {
+
+  @Override
+  public TTransport getClientTransport(TTransport underlyingTransport)
+  throws Exception {
+    TSSLTransportFactory.TSSLTransportParameters params = new
+      TSSLTransportFactory.TSSLTransportParameters();
+
+    params.setTrustStore(System.getProperty("javax.net.ssl.trustStore"), null);
+
+    return TSSLTransportFactory.getClientSocket(HOST, PORT, 0/*timeout*/, params);
+  }
+}