java.lang.NullPointerException

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  • In config.xml when I whitelist specific non http or https URLs such as {code}<allow-intent href="mailto:ktop500@gmail.com" />{code} and in index.html I add a link with that specific URL, {code}<a href="mailto:ktop500@gmail.com">mailto link</a>{code} I cannot access the link when I run the application. If I change the allow-intent to use a wildcard, *, I can get it to work. {code}<allow-intent href="mailto:*" />{code} The expected behavior is that I should be able to specify an exact URL in the whitelist, but I am not able to. I investigated the Whitelist plugin and Whitelist.java in cordova-android and I found the issue. First I looked at the whitelist itself. URLs from config.xml are added to the whitelist correctly. No problems here. Next I looked at how the URL from index.html is being compared to the whitelist. I traced through with the Android Studio debugger and found this: At [Line 85|https://github.com/apache/cordova-android/blob/master/framework/src/org/apache/cordova/Whitelist.java#L85] of Whitelist.java in cordova-android, there is actually a NullPointerException happening, but it didn't get printed out with the Log :( (this needs to be fixed). I made some modifications to Whitelist.java so that the stack trace gets printed out, along with with values of 'host'. {noformat} 03-17 13:46:47.399 14000-14000/? I/System.out: uri scheme: mailto 03-17 13:46:47.399 14000-14000/? I/System.out: whitelist scheme: mailto 03-17 13:46:47.399 14000-14000/? I/System.out: uri host: null 03-17 13:46:47.399 14000-14000/? I/System.out: whitelist host: ktop500@gmail\.com 03-17 13:46:47.400 14000-14000/? W/System.err: java.lang.NullPointerException: Attempt to invoke interface method 'int java.lang.CharSequence.length()' on a null object reference 03-17 13:46:47.400 14000-14000/? W/System.err: at java.util.regex.Matcher.reset(Matcher.java:177) 03-17 13:46:47.400 14000-14000/? W/System.err: at java.util.regex.Matcher.<init>(Matcher.java:90) 03-17 13:46:47.400 14000-14000/? W/System.err: at java.util.regex.Pattern.matcher(Pattern.java:297) 03-17 13:46:47.400 14000-14000/? W/System.err: at org.apache.cordova.Whitelist$URLPattern.matches(Whitelist.java:88) 03-17 13:46:47.400 14000-14000/? W/System.err: at org.apache.cordova.Whitelist.isUrlWhiteListed(Whitelist.java:168) 03-17 13:46:47.400 14000-14000/? W/System.err: at org.apache.cordova.whitelist.WhitelistPlugin.shouldOpenExternalUrl(WhitelistPlugin.java:132) 03-17 13:46:47.400 14000-14000/? W/System.err: at org.apache.cordova.PluginManager.shouldOpenExternalUrl(PluginManager.java:432) 03-17 13:46:47.400 14000-14000/? W/System.err: at org.apache.cordova.CordovaWebViewImpl$EngineClient.onNavigationAttempt(CordovaWebViewImpl.java:605) 03-17 13:46:47.400 14000-14000/? W/System.err: at org.apache.cordova.engine.SystemWebViewClient.shouldOverrideUrlLoading(SystemWebViewClient.java:79) 03-17 13:46:47.400 14000-14000/? W/System.err: at com.android.webview.chromium.WebViewContentsClientAdapter.shouldOverrideUrlLoading(WebViewContentsClientAdapter.java:336) 03-17 13:46:47.400 14000-14000/? W/System.err: at org.chromium.android_webview.AwContentsClient.shouldIgnoreNavigation(AwContentsClient.java:168) 03-17 13:46:47.400 14000-14000/? W/System.err: at org.chromium.android_webview.AwContentsClientBridge.shouldOverrideUrlLoading(AwContentsClientBridge.java:265) 03-17 13:46:47.400 14000-14000/? W/System.err: at org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce(Native Method) 03-17 13:46:47.400 14000-14000/? W/System.err: at org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:39) 03-17 13:46:47.401 14000-14000/? W/System.err: at android.os.Handler.dispatchMessage(Handler.java:102) 03-17 13:46:47.401 14000-14000/? W/System.err: at android.os.Looper.loop(Looper.java:135) 03-17 13:46:47.401 14000-14000/? W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5254) 03-17 13:46:47.401 14000-14000/? W/System.err: at java.lang.reflect.Method.invoke(Native Method) 03-17 13:46:47.401 14000-14000/? W/System.err: at java.lang.reflect.Method.invoke(Method.java:372) 03-17 13:46:47.401 14000-14000/? W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 03-17 13:46:47.401 14000-14000/? W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698){noformat} Whitelist host is correct, so that got parsed correctly, but the Uri host is not correct, it is null. We try to call host.matcher(null).matches with a null object and therefore got the NPE. Working backwards from here, the issue stems from Android's Uri class parsing the URL. At [Line 158|https://github.com/apache/cordova-android/blob/master/framework/src/org/apache/cordova/Whitelist.java#L158] of Whitelist.java, we call: {code}Uri parsedUri = Uri.parse(uri);{code} Using the debugger, once the uri gets parsed, you'll see that the value of 'host' is 'NOT_CACHED'. This is the part where I got lost in Android Uri class because it's hard to debug there. The conclusion that I came to is that Android's Uri class doesn't parse 'host' correctly, but does parse 'scheme' correctly. I also tested market: URL and that has the same behavior. Android's definition of 'host' is probably different from Cordova's definition of 'host' so we should try to use something other than the Uri class to parse the URL. Android's definition of 'host' is probably parsed to a ':' I can try to work on a solution to not use the Uri class to parse.
    via by Karen Tran,
  • I show alert dialog in exception Android
    via Stack Overflow by Paulinka
    ,
    • java.lang.NullPointerException: Attempt to invoke interface method 'int java.lang.CharSequence.length()' on a null object reference at java.util.regex.Matcher.reset(Matcher.java:177) at java.util.regex.Matcher.<init>(Matcher.java:90) at java.util.regex.Pattern.matcher(Pattern.java:297) at org.telegram.ui.LaunchActivity.handleIntent(LaunchActivity.java:646) at org.telegram.ui.LaunchActivity.onNewIntent(LaunchActivity.java:1366) at android.app.Instrumentation.callActivityOnNewIntent(Instrumentation.java:1212) at android.app.Instrumentation.callActivityOnNewIntent(Instrumentation.java:1224) at android.app.ActivityThread.deliverNewIntents(ActivityThread.java:2545) at android.app.ActivityThread.performNewIntents(ActivityThread.java:2557) at android.app.ActivityThread.handleNewIntent(ActivityThread.java:2566)

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