throwable

Catching all java.lang.Error for logging purposes and allowing them to work their way up the stack

由 泪湿孤枕 提交于 2019-12-11 13:38:09
问题 Short version: How do I catch all java.lang.Error thrown in a particular section of code in order to log them, and also allow them to propogate up the call stack as if I hadn't caught them at all? Long version... In a section of code I want to catch all java.lang.Error in order to log them. But I also want to let the Error continue to work its way up the call stack so the behaviour would be the same as if I hadn't caught it at all. Additionally, I want to catch and log all java.lang.Exception

Error code from Throwable - Android

由 谁都会走 提交于 2019-12-08 14:07:15
问题 How can I get the error code from the Throwable public void onFailure(Throwable exception) { } I saw that we can get the error messages, LocalizedMessage etc 回答1: Only HttpException gives you http error code. Make sure you check instance of before using it. Here is the code: if (throwable instanceof HttpException) { HttpException exception = (HttpException) throwable; switch (exception.code()) { case 400: // Handle code 400 break; case 500: // Handle code 500 break; default: break; } } 回答2:

Difference between NoSuchMethodException and NoSuchMethodError in Java

由 99封情书 提交于 2019-12-05 12:52:26
问题 I can't find exact difference between NoSuchMethodException and NoSuchMethodError in Java. Could someone give explanation and example of these two things ? 回答1: NoSuchMethodException can be thrown when you're invoking a method through reflection, and the name of the method comes from a variable in your program. NoSuchMethodError can be thrown when a compiled Java class does a regular method call to another class and the method doesn't exist. (This usually happens when the caller class was

How to set my own message in my custom exception in Java that can be retrieved my getMessage() BUT WITHOUT using the constructor, is there any way?

由 橙三吉。 提交于 2019-12-05 03:38:58
问题 I'm just learning about exception handling in Java. What I would like to know is rather than trying something like say: throw new Exception("My Message"); and String message=ex.getMessage(); System.out.println(message); Take a look at the code below , class ExceptionTest { public static void main(String[] args) { ExceptionTest t1=new ExceptionTest(); try { t1.riskyMethod();//call the risky or exception throwing method } catch(MyException myex) { System.out.println("Exception has been thrown")

Difference between NoSuchMethodException and NoSuchMethodError in Java

由 徘徊边缘 提交于 2019-12-03 23:48:32
I can't find exact difference between NoSuchMethodException and NoSuchMethodError in Java. Could someone give explanation and example of these two things ? NoSuchMethodException can be thrown when you're invoking a method through reflection, and the name of the method comes from a variable in your program. NoSuchMethodError can be thrown when a compiled Java class does a regular method call to another class and the method doesn't exist. (This usually happens when the caller class was compiled against one version of the class being called, and is being executed together with another version of

How to set my own message in my custom exception in Java that can be retrieved my getMessage() BUT WITHOUT using the constructor, is there any way?

由 谁都会走 提交于 2019-12-03 20:08:48
I'm just learning about exception handling in Java. What I would like to know is rather than trying something like say: throw new Exception("My Message"); and String message=ex.getMessage(); System.out.println(message); Take a look at the code below , class ExceptionTest { public static void main(String[] args) { ExceptionTest t1=new ExceptionTest(); try { t1.riskyMethod();//call the risky or exception throwing method } catch(MyException myex) { System.out.println("Exception has been thrown"); String message=myex.getMessage();//get the String passed during exception call System.out.println(

Java - Throwable to Exception

由 谁都会走 提交于 2019-12-03 15:59:53
问题 I am currently using the play2 framework. I have several classes which are throwing exceptions but play2s global onError handler uses throwable instead of an exception. for example one of my classes is throwing a NoSessionException . Can I check a throwable object if it is a NoSessionException ? 回答1: You can use instanceof to check it is of NoSessionException or not. Example: if (exp instanceof NoSessionException) { ... } Assuming exp is the Throwable reference. 回答2: Just make it short. We

Is there a favored idiom for mimicing Java's try/finally in C++?

由 偶尔善良 提交于 2019-12-03 12:42:55
问题 Been doing Java for number of years so haven't been tracking C++. Has finally clause been added to C++ exception handling in the language definition? Is there a favored idiom that mimics Java's try/finally? Am also bothered that C++ doesn't have an ultimate super type for all possible exceptions that could be thrown - like Java's Throwable class. I can write: try { // do something } catch(...) { // alas, can't examine the exception // can only do cleanup code and perhaps rethrow, ala: throw;

Best practices for catching Throwable in Java

由 空扰寡人 提交于 2019-12-03 11:58:26
问题 Sometimes, you just have to catch Throwable, e.g. when writing a dispatcher queue that dispatches generic items and needs to recover from any errors (said dispatcher logs all caught exceptions, but silently, and then execution is continued on other items). One best practice I can think of is to always rethrow the exception if it's InterruptedException, because this means someone interrupted my thread and wants to kill it. Another suggestion (that came from a comment, not an answer) is to

Best practices for catching Throwable in Java

由 别等时光非礼了梦想. 提交于 2019-12-03 02:29:39
Sometimes, you just have to catch Throwable, e.g. when writing a dispatcher queue that dispatches generic items and needs to recover from any errors (said dispatcher logs all caught exceptions, but silently, and then execution is continued on other items). One best practice I can think of is to always rethrow the exception if it's InterruptedException, because this means someone interrupted my thread and wants to kill it. Another suggestion (that came from a comment, not an answer) is to always rethrow ThreadDeath Any other best practices? Probably the most important one is, never swallow a
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