Caused by: java.lang.NullPointerException: inputStream

Web Testing
1

============== ROOT CAUSE =====================

Caused by: java.lang.NullPointerException: inputStream

For trouble shooting, please visit: Troubleshoot common exceptions | Katalon Docs

================================================

07-12-2025 09:17:25 pm Test Cases/Verify Correct Alarm Message

Elapsed time: 0.629s

Test Cases/Verify Correct Alarm Message FAILED.

Reason:

com.kms.katalon.core.exception.StepFailedException: Unable to start application: ‘C:\Users\samar\Katalon Studio\sample 1\androidapp\APIDemos.apk’

at com.kms.katalon.core.mobile.keyword.internal.MobileKeywordMain.stepFailed(MobileKeywordMain.groovy:65)

at com.kms.katalon.core.mobile.keyword.internal.MobileKeywordMain.runKeyword(MobileKeywordMain.groovy:34)

at com.kms.katalon.core.mobile.keyword.builtin.StartApplicationKeyword.startApplication(StartApplicationKeyword.groovy:91)

at com.kms.katalon.core.mobile.keyword.builtin.StartApplicationKeyword.execute(StartApplicationKeyword.groovy:48)

at

1 Like
2

You get a “NullPointerException” when the definition and contents of a variable, or Test Object, does not exist. Can you show us your code around the variable: “inputStream”? For instance, if I have only have the statement:

WebUI.comment("What is it all about ${inputStream})"

without defining and initializing the variable, inputStream, we will get a “NullPointerException”. However, if we have as a single statement like:

def inputStream = "...some value..."

WebUI.comment("What is it all about ${inputStream})"

or, as a couple of statements, like:

def inputStream = null

inputStream = "...some value..."

WebUI.comment("What is it all about ${inputStream})"

Then, “inputStream” is defined, and initialized, and you will NOT get an exception. So, again, show us your code around the variable, “inputStream”, and maybe we can spot something.

1 Like
3

kindly format the code blocks with ``` `for better readability


Caused by: java.lang.NullPointerException: inputStream

For trouble shooting, please visit: Troubleshoot common exceptions | Katalon Docs

================================================

07-12-2025 09:17:25 pm Test Cases/Verify Correct Alarm Message

Elapsed time: 0.629s

Test Cases/Verify Correct Alarm Message FAILED.

Reason:

com.kms.katalon.core.exception.StepFailedException: Unable to start application: ‘C:\Users\samar\Katalon Studio\sample 1\androidapp\APIDemos.apk’

at com.kms.katalon.core.mobile.keyword.internal.MobileKeywordMain.stepFailed(MobileKeywordMain.groovy:65)

at com.kms.katalon.core.mobile.keyword.internal.MobileKeywordMain.runKeyword(MobileKeywordMain.groovy:34)

at com.kms.katalon.core.mobile.keyword.builtin.StartApplicationKeyword.startApplication(StartApplicationKeyword.groovy:91)

at com.kms.katalon.core.mobile.keyword.builtin.StartApplicationKeyword.execute(StartApplicationKeyword.groovy:48)

at
4

The NullPointerException: inputStream error occurs when Katalon can’t access the APK file.

Immediate Fixes:

  1. Fix APK Path Handling:

groovy

// Use forward slashes
String appPath = "C:/Users/samar/Katalon Studio/sample 1/androidapp/APIDemos.apk"

// Or escape backslashes
String appPath = "C:\\\\Users\\\\samar\\\\Katalon Studio\\\\sample 1\\\\androidapp\\\\APIDemos.apk"
  1. Verify File Exists:
    Add this check before starting the app:

groovy

import java.nio.file.*

String appPath = "C:/Users/samar/Katalon Studio/sample 1/androidapp/APIDemos.apk"
Path apkPath = Paths.get(appPath)

if (!Files.exists(apkPath)) {
    throw new Exception("APK not found at: " + appPath)
}

Mobile.startApplication(appPath, false)
  1. Reinstall APK via ADB:
  2. Connect device
  3. Run in CMD:

text

adb uninstall io.appium.android.apis
adb install "C:\Users\samar\Katalon Studio\sample 1\androidapp\APIDemos.apk"

Critical Checks:

  1. File Corruption:
  • Re-download the APK file
  • Verify MD5 checksum (original vs your copy)
  1. Path with Spaces:
    Move project to a space-free path:

text

- C:\Users\samar\Katalon Studio\sample 1\
+ C:\Katalon_Projects\sample1\
  1. Katalon Configuration:
    Go to Project Settings > Execution > Default Mobile:
  • Set “Start application with” to Path relative to project
  • Move APK to Include folder
  • Use in script:

groovy

String appPath = RunConfiguration.getProjectDir() + "/Include/APIDemos.apk"

ADB-Specific Fixes:

  1. Kill ADB Server:

text

adb kill-server
adb start-server
adb devices
  1. Check Device Authorization:
  • Revoke USB debugging authorizations on device
  • Reconnect device and “Always allow” prompt

Alternative Approach:

Use package name instead of APK path:

groovy

Mobile.startApplication('io.appium.android.apis', false)

If Issue Persists:

  1. Create new test case with only:

groovy

String appPath = "C:/path/to/your.apk" // Use corrected path
Mobile.startApplication(appPath, true)
  1. Run in debug mode (right-click → Debug)
  2. Check “Console” tab for detailed errors
1 Like
5

it is a default file for – sample test for mobile in katalon studio

still got this error

1 Like
6

Hi @grylion54,

Can you help @samarthpatil450 more on this? Appreciate your help