diff -ruNp rxtx-2.1.7r2.orig/src/SerialImp.c rxtx-2.1.7r2/src/SerialImp.c
--- rxtx-2.1.7r2.orig/src/SerialImp.c	2009-07-11 11:45:34.000000000 +0200
+++ rxtx-2.1.7r2/src/SerialImp.c	2009-07-11 20:24:29.000000000 +0200
@@ -1339,7 +1339,7 @@ int init_threads( struct event_info_stru
 	report("init_threads: get eis\n");
 	jeis  = (*eis->env)->GetFieldID( eis->env, eis->jclazz, "eis", "J" );
 	report("init_threads: set eis\n");
-	(*eis->env)->SetIntField(eis->env, *eis->jobj, jeis, ( size_t ) eis );
+	(*eis->env)->SetLongField(eis->env, *eis->jobj, jeis, ( size_t ) eis );
 	report("init_threads:  stop\n");
 	report_time_end( );
 	return( 1 );
@@ -1532,7 +1532,7 @@ JNIEXPORT jboolean JNICALL RXTXPort(nati
 	jobject jobj, jboolean interrupted )
 {
 	int fd = get_java_var( env, jobj,"fd","I" );
-	struct event_info_struct *eis = ( struct event_info_struct * ) get_java_var( env, jobj, "eis", "J" );
+	struct event_info_struct *eis = ( struct event_info_struct * ) get_java_var_long( env, jobj, "eis", "J" );
 	int result, count=0;
 
 	char message[80];
@@ -2941,7 +2941,7 @@ int read_byte_array( JNIEnv *env,
 	/* TRENT */
 	int flag, count = 0;
 	struct event_info_struct *eis = ( struct event_info_struct * )
-		get_java_var( env, *jobj,"eis","J" );
+		get_java_var_long( env, *jobj,"eis","J" );
 	
 	report_time_start();
 	flag = eis->eventflags[SPE_DATA_AVAILABLE];
@@ -4875,9 +4875,9 @@ get_java_var
    exceptions:  none
    comments:
 ----------------------------------------------------------*/
-size_t get_java_var( JNIEnv *env, jobject jobj, char *id, char *type )
+long get_java_var_long( JNIEnv *env, jobject jobj, char *id, char *type )
 {
-	int result = 0;
+	long result = 0;
 	jclass jclazz = (*env)->GetObjectClass( env, jobj );
 	jfieldID jfd = (*env)->GetFieldID( env, jclazz, id, type );
 
@@ -4891,7 +4891,11 @@ size_t get_java_var( JNIEnv *env, jobjec
 		LEAVE( "get_java_var" );
 		return result;
 	}
-	result = (int)( (*env)->GetIntField( env, jobj, jfd ) );
+	if ( !strcmp( type, "J" ) ) {
+		result = (long)( (*env)->GetLongField( env, jobj, jfd ) );
+	} else {
+		result = (int) ( (*env)->GetIntField( env, jobj, jfd ) );
+	}
 /* ct7 & gel * Added DeleteLocalRef */
 	(*env)->DeleteLocalRef( env, jclazz );
 	if(!strncmp( "fd",id,2) && result == 0)
@@ -4902,6 +4906,10 @@ size_t get_java_var( JNIEnv *env, jobjec
 	return result;
 }
 
+int get_java_var( JNIEnv *env, jobject jobj, char *id, char *type ) {
+	return (int) get_java_var_long( env, jobj, id, type );
+}
+
 /*----------------------------------------------------------
 throw_java_exception
 
diff -ruNp rxtx-2.1.7r2.orig/src/SerialImp.h rxtx-2.1.7r2/src/SerialImp.h
--- rxtx-2.1.7r2.orig/src/SerialImp.h	2005-07-05 19:47:21.000000000 +0200
+++ rxtx-2.1.7r2/src/SerialImp.h	2009-07-11 20:19:51.000000000 +0200
@@ -413,7 +413,8 @@ int translate_parity( JNIEnv *, tcflag_t
 void system_wait();
 void finalize_event_info_struct( struct event_info_struct * );
 int read_byte_array( JNIEnv *, jobject *, int, unsigned char *, int, int );
-size_t get_java_var( JNIEnv *, jobject, char *, char * );
+int get_java_var( JNIEnv *, jobject, char *, char * );
+long get_java_var_long( JNIEnv *, jobject, char *, char * );
 jboolean is_interrupted( struct event_info_struct * );
 int send_event(struct event_info_struct *, jint, int );
 void dump_termios(char *,struct termios *);