java: solved callbacks

Signed-off-by: Stefan Andritoiu <stefan.andritoiu@intel.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

src/hcsr04/hcsr04.cxx

@@ -31,6 +31,14 @@
 
 using namespace upm;
 
+#ifdef SWIGJAVA
+void 
+HCSR04::HCSR04 (uint8_t triggerPin, uint8_t echoPin, IsrCallback *cb);
+{
+        HCSR04 (triggerPin, echoPin, generic_callback_isr);
+}
+#endif
+
 HCSR04::HCSR04 (uint8_t triggerPin, uint8_t echoPin, void (*fptr)(void *)) {
     mraa_result_t error  = MRAA_SUCCESS;
     m_name              = "HCSR04";