diff --git a/ompi/mpi/java/c/mpi_MPI.c b/ompi/mpi/java/c/mpi_MPI.c
index f0fe93eca3..fcdd4966b5 100644
--- a/ompi/mpi/java/c/mpi_MPI.c
+++ b/ompi/mpi/java/c/mpi_MPI.c
@@ -78,7 +78,7 @@
 
 ompi_java_globals_t ompi_java = {0};
 int ompi_mpi_java_eager = 65536;
-opal_free_list_t ompi_java_buffers = {0};
+opal_free_list_t ompi_java_buffers = {{0}};
 static void *libmpi = NULL;
 
 static void bufferConstructor(ompi_java_buffer_t *item)
diff --git a/ompi/mpi/java/c/mpi_Win.c b/ompi/mpi/java/c/mpi_Win.c
index fe045fb175..2c55359cce 100644
--- a/ompi/mpi/java/c/mpi_Win.c
+++ b/ompi/mpi/java/c/mpi_Win.c
@@ -43,7 +43,8 @@ JNIEXPORT jlong JNICALL Java_mpi_Win_createWin(
     return (jlong)win;
 }
 
-JNIEXPORT jlong JNICALL Java_mpi_Win_create_dynamicWin(
+JNIEXPORT jlong JNICALL Java_mpi_Win_createDynamicWin(
+        JNIEnv *env, jobject jthis,
         jlong info, jlong comm)
 {
     MPI_Win win;
@@ -56,24 +57,22 @@ JNIEXPORT jlong JNICALL Java_mpi_Win_create_dynamicWin(
 }
 
 JNIEXPORT void JNICALL Java_mpi_Win_attach(
-        JNIEnv *env, jobject jthis, jobject jBase,
+        JNIEnv *env, jobject jthis, jlong win, jobject jBase,
         jint size)
 {
     void *base = (*env)->GetDirectBufferAddress(env, jBase);
-    MPI_Win win;
 
-    int rc = MPI_Win_attach(win, base, (MPI_Aint)size);
+    int rc = MPI_Win_attach((MPI_Win)win, base, (MPI_Aint)size);
 
     ompi_java_exceptionCheck(env, rc);
 }
 
 JNIEXPORT void JNICALL Java_mpi_Win_detach(
-        JNIEnv *env, jobject jthis, jobject jBase)
+        JNIEnv *env, jobject jthis, jlong win, jobject jBase)
 {
     void *base = (*env)->GetDirectBufferAddress(env, jBase);
-    MPI_Win win;
 
-    int rc = MPI_Win_detach(win, base);
+    int rc = MPI_Win_detach((MPI_Win)win, base);
 
     ompi_java_exceptionCheck(env, rc);
 }
diff --git a/ompi/mpi/java/java/Comm.java b/ompi/mpi/java/java/Comm.java
index 5124d69f5d..729ffdb985 100644
--- a/ompi/mpi/java/java/Comm.java
+++ b/ompi/mpi/java/java/Comm.java
@@ -233,18 +233,6 @@ public final boolean isNull()
     return handle == nullHandle;
 }
 
-/**
- * Java binding of {@code MPI_COMM_GET_INFO}.
- * @throws MPIException 
- */
-public final Info getInfo() throws MPIException
-{
-    MPI.check();
-    return getInfo(handle);
-}
-
-private native void getInfo(long handle, long info) throws MPIException;
-
 /**
  * Java binding of {@code MPI_COMM_SET_INFO}.
  * @param info info object
diff --git a/ompi/mpi/java/java/Win.java b/ompi/mpi/java/java/Win.java
index 793b99f984..f968618883 100644
--- a/ompi/mpi/java/java/Win.java
+++ b/ompi/mpi/java/java/Win.java
@@ -76,10 +76,10 @@ private native long createWin(
 public Win(Info info, Comm comm)
     throws MPIException
 {
-    handle = createWinDynamic(info.handle, comm.handle);
+    handle = createDynamicWin(info.handle, comm.handle);
 }
 
-private native long createWinDynamic(
+private native long createDynamicWin(
         long info, long comm)
         throws MPIException;
 
@@ -99,7 +99,8 @@ private int getBaseType(Datatype orgType, Datatype targetType)
 
 /**
  * Java binding of {@code MPI_WIN_ATTACH}.
- * @param assertion program assertion
+ * @param base     initial address of window
+ * @param size     size of window (buffer elements)
  */
 public void attach(Buffer base, int size) throws MPIException
 {
@@ -129,7 +130,7 @@ private native void attach(long win, Buffer base, int size) throws MPIException;
 
 /**
  * Java binding of {@code MPI_WIN_DETACH}.
- * @param assertion program assertion
+ * @param base     initial address of window
  */
 public void detach(Buffer base) throws MPIException
 {
@@ -475,10 +476,10 @@ private native long free(long win) throws MPIException;
 public Info getInfo() throws MPIException
 {
     MPI.check();
-    return getInfo(handle);
+    return new Info(getInfo(handle));
 }
 
-private native Info getInfo(long win)
+private native long getInfo(long win)
         throws MPIException;
 
 /**
@@ -489,10 +490,10 @@ private native Info getInfo(long win)
 public void setInfo(Info info) throws MPIException
 {
     MPI.check();
-    setInfo(handle, info);
+    setInfo(handle, info.handle);
 }
 
-private native void setInfo(long win, Info info)
+private native void setInfo(long win, long info)
         throws MPIException;
 
 } // Win