#vulnerable code 
                                @Test
    public void getgroups() throws Throwable {
        if (jnr.ffi.Platform.getNativePlatform().isUnix()) {
            InputStreamReader isr = null;
            BufferedReader reader = null;

            try {
                isr = new InputStreamReader(Runtime.getRuntime().exec("id -G").getInputStream());
                reader = new BufferedReader(isr);

                String[] groupIdsAsStrings = reader.readLine().split(" ");
                long[] expectedGroupIds = new long[groupIdsAsStrings.length];

                for (int i = 0; i < groupIdsAsStrings.length; i++) {
                    expectedGroupIds[i] = Long.parseLong(groupIdsAsStrings[i]);
                }

                long[] actualGroupIds = posix.getgroups();

                Arrays.sort(expectedGroupIds);
                Arrays.sort(actualGroupIds);

                assertArrayEquals(expectedGroupIds, actualGroupIds);
            } finally {
                if (reader != null) {
                    reader.close();
                }

                if (isr != null) {
                    isr.close();
                }
            }
        }
    } 
                            #location 8 
                            #vulnerability type RESOURCE_LEAK
#fixed code
                                @Test
    public void getgroups() throws Throwable {
        if (jnr.ffi.Platform.getNativePlatform().isUnix()) {
            String[] groupIdsAsStrings = exec("id -G").split(" ");
            long[] expectedGroupIds = new long[groupIdsAsStrings.length];

            for (int i = 0; i < groupIdsAsStrings.length; i++) {
                expectedGroupIds[i] = Long.parseLong(groupIdsAsStrings[i]);
            }

            long[] actualGroupIds = posix.getgroups();

            // getgroups does not specify whether the effective group ID is included along with the supplementary
            // group IDs. However, `id -G` always includes all group IDs. So, we must do something of a fuzzy match.
            // If the actual list is shorter than the expected list by 1, alter the expected list by removing the
            // effective group ID before comparing the two arrays.
            if (actualGroupIds.length == expectedGroupIds.length - 1) {
                long effectiveGroupId = Long.parseLong(exec("id -g"));
                expectedGroupIds = removeElement(expectedGroupIds, effectiveGroupId);
            }

            Arrays.sort(expectedGroupIds);
            Arrays.sort(actualGroupIds);

            assertArrayEquals(expectedGroupIds, actualGroupIds);
        }
    }