Error: Exception in HostObject::get(propName:JailMonkey): java.lang.NullPointerException

[sahil290791]

jail-monkey version: 2.3.2
RN: 0.61.5

Setup:
android/app/build.gradle:

dependencies {
   ....
   ....
   ....
    implementation project(':jail-monkey')
    implementation project(':react-native-branch')
   ....

settings.build.gradle

include ':jail-monkey'
project(':jail-monkey').projectDir = new File(rootProject.projectDir, '../node_modules/jail-monkey/android')

I am getting this error in some of the android devices (Samsung note 20 Ultra):

com.facebook.react.common.JavascriptException: Error: Exception in HostObject::get(propName:JailMonkey): java.lang.NullPointerException, stack:
<unknown>@1788:122
v@2:1474
<unknown>@1785:349
v@2:1474
<unknown>@386:200
v@2:1474
<unknown>@6:58
v@2:1474
d@2:876
global code@3823:4

at com.facebook.react.modules.core.ExceptionsManagerModule.reportException(ExceptionsManagerModule.java
  at java.lang.reflect.Method.invoke (Method.java)
  at com.facebook.react.bridge.JavaMethodWrapper.invoke (JavaMethodWrapper.java:371)
  at com.facebook.react.bridge.JavaModuleWrapper.invoke (JavaModuleWrapper.java:150)
  at com.facebook.react.bridge.queue.NativeRunnable.run (NativeRunnable.java)
  at android.os.Handler.handleCallback (Handler.java:938)
  at android.os.Handler.dispatchMessage (Handler.java:99)
  at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage (MessageQueueThreadHandler.java:26)
  at android.os.Looper.loop (Looper.java:246)
  at com.facebook.react.bridge.queue.MessageQueueThreadImpl$4.run (MessageQueueThreadImpl.java:225)
  at java.lang.Thread.run (Thread.java:923)

Can you please help on what might be wrong here?

[bohdansushchak]

I have the same issue
"jail-monkey": "^2.3.3",
"react-native": "0.61.5",

Samsung Galaxy Note9, Android 10
Samsung Galaxy S9+, Android 10

[hwq0521]

I have the same issue
"jail-monkey": "^2.3.2",
"react-native": "0.61.5",

Galaxy Note10+, Android 10
Galaxy Note9, Android 10
Galaxy S20+, Android 11

[nzankich]

Getting this issue as well. It seems to be exclusive to Samsung devices.

It comes in as
Exception in HostObject::get(propName:JailMonkey): java.lang.NullPointerException: Attempt to get length of null array
sometimes as well

[nzankich]

my team only uses the mocked location and rooted check so it must be from one of those. If I had to guess it's coming from the mocked location check here:

                    pm.getInstalledApplications(PackageManager.GET_META_DATA);

Android docs say that it can't come back as null
https://developer.android.com/reference/android/content/pm/PackageManager#getInstalledApplications(int)

BUT I do see some cases online where people say it's coming back as null if permission settings are wrong. it's just a guess though. Almost everything else in there is covered by try/catches

[mountainfirefly]

@nzankich If at the android side it is coming as null, does it mean it is not a rooted device?

[nzankich]

@mountainfirefly if anything it would be the opposite. maybe the rooted device is disrupting/blocking that check?

I don't think there is any correlation though. I think Samsung devices have a bug/are just doing something against Android specs

[pke]

Had this problem today too and came here via google. Samsung device. Any idea what could cause it?
Could be our JM version is too old, this seems to have been fixed in 2.6.0
2492b47