I have access to test.h and test.so files:

test.h

```
int insert_data(void *location_data, uint64_t device_id, uint64_t event_id,
                uint64_t motion_seq, uint64_t utc_time, uint32_t sensor_seq,
                uint32_t device_seq, uint32_t tick_mark, uint16_t ble,
                int movement, int path_id);

```

I am now writing JNA code to call the above method.

```
interface TestCLibrary extends Library {
    TestCLibrary INSTANCE = (TestCLibrary) Native.loadLibrary(“test”, TestCLibrary);

    int insert_data(Pointer test_data, long device_id, long event_id,
                    long motion_seq, long utc_time, int sensor_seq,
                    int device_seq, int tick_mark, short ble,
                    int movement, int path_id);
 }

```

---

```
public class JNATest {
    public static void main(String[] args) throws IOException{ 
        Native.setProtected(true); 
        int path_id = 1, movement = 1, tick_mark = 1, device_seq = 1;
        long utc_time = System.currentTimeMillis();
        int sensor_seq = 100;
        short ble = 25;
        long motion_seq = 22222299;
        long device_id = 111122333;
        long event_id = 44445555;  

        Pointer test_data = Pointer.NULL; 

        TestCLibrary.INSTANCE.insert_data(test_data, device_id, event_id, motion_seq, utc_time, sensor_seq, device_seq, tick_mark, ble, movement, path_id);
   }
}

```

---

While running the JNATest facing following exception at this code location:

> 
> 
> > 
> > TestCLibrary.INSTANCE.insert\_data
> > 
> > 
> > 
> 
> 
> Exception in thread "main" java.lang.Error: Invalid memory access at
> com.sun.jna.Native.invokeInt(Native Method) at
> com.sun.jna.Function.invoke(Function.java:419) at
> com.sun.jna.Function.invoke(Function.java:354) at
> com.sun.jna.Library$Handler.invoke(Library.java:244) at
> com.test.apps.$Proxy0.insert\_data(Unknown Source) ....
> 
> 
> 

How to avoid such error ?
and how can I initialize a Pointer in JNA with default value ?