anomaly extracts

Exception (" manually created thread exception "); = = T.exception.flatten () ...);4) When using await (asynchronous), directly in the GUI thread try......catch ... Catch exceptions (like normal code, what exceptions catch what exceptions).5) All task exceptions (not using await or wait, pure multithreaded exceptions, internal not processed) cannot be captured by the main thread, and should be in WinForm (console console in main entry function), Using taskschedule.unobservedtaskexce

(| | a| |.| | b| |. Sina), and the ratio of the intersection of two segments to each segment is precisely calculated by calculating the ratio of pertdotproduct, because they form a parallelogram of a common bottom, so the ratio of area to height is equal to The height is exactly the distance from the beginning of one line segment to the point of intersection and from the beginning to the end point.　　My own solution is to choose the last kind of dtintersectsegseg2d, the effect is also the best.

is not used inHibernateThe lazy load,Unnecessary Association queries at that time caused the system to display slowly by optimizingSQLstatement resolves the.Why don't we just lazy load such a good thing?because our lazy load operation is completely out of theHibernateSessionthe scope,one isEJBin the containerSession,one isSpringin theHibernate Session,out of range, of course, it doesn't work.. Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not repro

in this exceptional case, Flume was not working properly.Problem recurrenceBased on the above inference, this exception can be verified as follows:Hiveserver Generating logsPerform multiple hivesql in hueManually force shutdown of MySQLManually restart the MySQL instance written by Flume.View Flume PerformanceFlume enters an infinite loop that throws an exception state, verifying success.SummarizeThe main reason here is the chain reaction caused by the MySQL service exception. Expediency can co

Recently used hibernate search this componentThis component is a full-text index of the domain model, and Lucene technology is used in the implementation of the full-text retrieval.It took a lot of effort to fix the package when we were doing a little test.I validate it directly from an instanceI started with the latest Hibernate-search package, causing the direct problem is the various packages inconsistentThis problem took me a long time, the most prominent exception is Java.lang.VerifyErrorIn

not the spring transaction management, how to get the spring Managed bean, i.e. Fooservice fooservice = Ctx.getbean ( "Xxxxdao" ,fooservice. class) --This Xxxxdao is Transactionproxyfactorybean Bean or its subclass bean (must take its subclass bean when it is abstract)The first parameter above is the transaction bean, the second parameter is the proxy target object that we want (must use the interface class, not the concrete implementation class), so that the service to get the spri

of sum. //public int getsum () { publicSynchronizedintGetsum () {//error: No write synchronized to modify Getsum () method, so that a java.lang.IllegalMonitorStateException exception occurred Try{System. out. println (thread.currentthread (). getName () +"the manager waits here for the result ..."); this. Wait ();//wait}Catch(interruptedexception E) {}returnsum; }}package com.bjsxt.d822.a2; public classSubthread9test { public Static voidmain (string[] Args) {System. out. println (th

capture =======================");String msg;if (ex instanceof businessexception) {msg = Ex.getmessage ();} else {msg = "Operation exception!";}Ex.printstacktrace ();PrintWriter out = null;try {out = Response.getwriter ();Out.print (Json.tojson (Resultjson.buildfailinstance (msg)). toString ());} catch (Exception e) {E.printstacktrace ();} finally {Ioutils.close (out);}return null;}}2, test the exception information, in the Hellocontroller.java to create abnormal information@RestController Pub

:- I Configure the network adapter for monitoring, such as: # Iftop - i eth1- b in bytes Show traffic for units ( bits is the default ) , such as: # Iftop - b- N make Host information is displayed by default directly IP , such as: # Iftop - N- N The port information is displayed by default directly, such as : # Iftop - N- F display traffic for a specific segment, such as # Iftop - F 10.10.1.0/24 or # Iftop - F 10.10.1.0/255.255.255.0- H ( Display this message ), help, display parameter informati

detects that Modecount and expectedmodcount are not equal and throws an exception.What if the If statement is written as if (S.equals ("String5")) without throwing the exception? Arraylist$itr also has a field named cursor that points to the index of the element to be manipulated at iteration, with an initial value of 0, and a value of 1 for each call to the next method, noting that the element is first removed from the collection plus 1. When judging "string5", note is the second-to-last eleme

Reference: http://blog.csdn.net/javaeeteacher/article/details/4485834This is a very common exception, from the name of the array subscript out-of-bounds error, the workaround is to see why the subscript is out of bounds.The following is an example of an error:Exception in thread "main" Java.lang.arrayindexoutofboundsexception:2At Test4. State.nextstates (state.java:93)At Test4. State.main (state.java:478)The following information can be obtained from these hints:1, error occurred in 93 lines2. W

+--deprecationwarning+--pendingdeprecationwarning+--runtimewarning+--syntaxwarning+--userwarning+--futurewarning+--importwarning+--unicodewarning+--byteswarning+--resourcewarning3. Exception Handling 1.try statementTryDetection RangeExcept Exception [as reason]:Code to be processed after exception appearsYou can have multiple except and try combinations, because the detection range can produce multiple exceptions, and you can use multiple except and try combinations to focus on the exceptions yo

the program to recover from panic and returns panic value. The function that caused the panic exception will not continue, but will return normallyPackage Mainimport ( "FMT")/* Exercise 5.19: Use panic and recover to write a function that does not contain a return statement but can return a value other than 0. */func Main () { fmt. Println (Recovertest (20))//Return to 20}/*1. Originally only defined return type, now give the return value an appropriate name, directly using the in

guess it may be written above this paragraph with the launch of the Tomcat server in eclipse does not matter, so can not solve the problem of Tomcat error. 5Third method: Modify Eclipse's Run configurations. 6Click "Run"-"Run Configurations" and click on the "Arguments" tab in the window that opens. 7In VM arguments, enter the bottom of the content:-xms256m-xmx512m-xx:maxnewsize=256m-xx:maxpermsize=256m 8After saving again after restart, no more error.It was this method that solved my p

The possibility analysis of java.net.SocketException anomaly Recently in an MQ project, when deployed, after running every two or three days down the machine once, the software died. Through System log Analysis: InforSuiteV6.0.0 Build2009042101 started 2010-3-29 15:58:36 clientcommunicatoradmin Restart Warning: Failed to restart:java.io.IOException:Failed to get a RMI stub:javax.na Ming.communicationexception [Root exception is Java.rmi.ConnectIOExcep

basically negligible. Although these results show that exception handling itself does not affect code performance, it does not solve the following problem: Who is responsible for the significant impact of an exception on performance? I'm obviously missing out on something important. Having thought it over again, I realized that I had missed an important part of the exception handling. I'm not thinking about what you did when the anomaly happened. I

is, if the throw statement is independent, the following do not define other statements because they are not executed.3. Throws represents a possibility of an exception that does not necessarily occur, throw throws an exception, and execution throw must throw an exception object.4. Both are negative ways to handle the anomaly (the negative here is not to say that this is bad), just throw or possibly throw an exception, but not by the function to hand

the principle and introduction of Atitit anomaly mechanism and exception handling1.1. atitit. The design principle of the anomaly mechanism . docx11.2. termination mode vs Recovery mode (ASP11.3. Handling exceptions for reflection methods 11.4. Re- throwing exceptions and exception chains 21.5. Finally handling of abnormal loss 31.1.Atitit. design principle of anom