stack-trace

问题 My Web application, which runs in Apache Tomcat/8.0.21, with JVM 1.8.0_45-b15 and Windows Server 2012 on a 16-core (32- with HT) Dual-Xeon NUMA machine, can get stuck, in some very unfortunate circumstances, when the actions described in the title occur at the same time in two different threads. The thread doing the first action ( getStackTrace() ) is trying to perform some diagnostic to detect which part of the system is slowing things down and gets stuck while calling Thread.dumpThreads .

问题 My Web application, which runs in Apache Tomcat/8.0.21, with JVM 1.8.0_45-b15 and Windows Server 2012 on a 16-core (32- with HT) Dual-Xeon NUMA machine, can get stuck, in some very unfortunate circumstances, when the actions described in the title occur at the same time in two different threads. The thread doing the first action ( getStackTrace() ) is trying to perform some diagnostic to detect which part of the system is slowing things down and gets stuck while calling Thread.dumpThreads .

问题 My Web application, which runs in Apache Tomcat/8.0.21, with JVM 1.8.0_45-b15 and Windows Server 2012 on a 16-core (32- with HT) Dual-Xeon NUMA machine, can get stuck, in some very unfortunate circumstances, when the actions described in the title occur at the same time in two different threads. The thread doing the first action ( getStackTrace() ) is trying to perform some diagnostic to detect which part of the system is slowing things down and gets stuck while calling Thread.dumpThreads .

问题 I have two simple wrappers that handle requests in my single page application. One wraps fetch and throws an error if a response is not ok (not in the 200-300 range): const fetchy = (...args) => fetch(...args).then(response => { if (response.ok) { return response } throw new Error(response.statusText) }) export default fetchy And one wraps fetchy and is used for GET requests: const get = endpoint => { const headers = new Headers({ Authorization: `Bearer ${TOKEN}` }) const init = { method:

问题 By default log4j2 prints stacktrace on multiple lines, separated by newline characters. Something like: java.lang.NullPointerException: error enovountered at ... at ... at ... I want my stacktrace on a single line, something like, essentially using | as a delimiter rather than \n java.lang.NullPointerException: error enovountered at ... | at ... | at ... How will I accomplish something like this in log4j2? 回答1: As the PatternLayout documentation specifies, the %throwable family of conversion

问题 By default log4j2 prints stacktrace on multiple lines, separated by newline characters. Something like: java.lang.NullPointerException: error enovountered at ... at ... at ... I want my stacktrace on a single line, something like, essentially using | as a delimiter rather than \n java.lang.NullPointerException: error enovountered at ... | at ... | at ... How will I accomplish something like this in log4j2? 回答1: As the PatternLayout documentation specifies, the %throwable family of conversion

问题 I am not able to backtrace using the bt command in debug mode after crash. I have searched but did not get the solution. I have tried [NSThread callStackSymbols] , but it gives the same message in console: Console is not supported for a recorded stack frame How can I do this? 回答1: There's nothing wrong with your Xcode, you just need to select the appropriate instance from the debug navigator, like this. To open the gif, follow this link: https://i.stack.imgur.com/IYOeY.gif 回答2: I solved this

问题 I am not able to backtrace using the bt command in debug mode after crash. I have searched but did not get the solution. I have tried [NSThread callStackSymbols] , but it gives the same message in console: Console is not supported for a recorded stack frame How can I do this? 回答1: There's nothing wrong with your Xcode, you just need to select the appropriate instance from the debug navigator, like this. To open the gif, follow this link: https://i.stack.imgur.com/IYOeY.gif 回答2: I solved this

问题 Background This question is related to Why does String.valueOf(null) throw a NullPointerException? Consider the following snippet: public class StringValueOfNull { public static void main(String[] args) { String.valueOf(null); // programmer intention is to invoke valueOf(Object), but instead // code invokes valueOf(char[]) and throws NullPointerException } } As explained in the answer to the linked question, Java's method overloading resolves the above invokation to String.valueOf(char[]),

问题 Background This question is related to Why does String.valueOf(null) throw a NullPointerException? Consider the following snippet: public class StringValueOfNull { public static void main(String[] args) { String.valueOf(null); // programmer intention is to invoke valueOf(Object), but instead // code invokes valueOf(char[]) and throws NullPointerException } } As explained in the answer to the linked question, Java's method overloading resolves the above invokation to String.valueOf(char[]),