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PersistentObjectException: detached entity passed to persist thrown by JPA and Hibernate
... there are many code examples in books (even in good ones) and through the net, which do exactly that. I don't know, why... Perhaps sometimes simply copied over and over without much thinking...
Guess what happens if you call remove(transaction) still having "cascade ALL" in that @ManyToOne? The a...
What are the differences between 'call-template' and 'apply-templates' in XSL?
...nts and deals with polymorphism.
Reference: See this whole thread: http://www.biglist.com/lists/lists.mulberrytech.com/xsl-list/archives/200411/msg00546.html
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How is Docker different from a virtual machine?
...r and a full VM. How does it manage to provide a full filesystem, isolated networking environment, etc. without being as heavy?
...
SQL JOIN vs IN performance?
...th=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672
https connection using CURL from command line
...
Simple solution
That's my everyday script:
curl --insecure -v https://www.google.com 2>&1 | awk 'BEGIN { cert=0 } /^\* Server certificate:/ { cert=1 } /^\*/ { if (cert) print }'
Output:
* Server certificate:
* subject: C=US; ST=California; L=Mountain View; O=Google Inc; CN=www.goog...
What is Delegate? [closed]
...e -= operator.
Delegate types are derived from the Delegate class in the .NET Framework. Delegate types are sealed—they cannot be derived.
Because the instantiated delegate is an object, it can be passed as a parameter, or assigned to a property. This allows a method to accept a delegate as a par...
How to list the files inside a JAR file?
...e that works for both IDE's and .jar files:
import java.io.*;
import java.net.*;
import java.nio.file.*;
import java.util.*;
import java.util.stream.*;
public class ResourceWalker {
public static void main(String[] args) throws URISyntaxException, IOException {
URI uri = ResourceWalker...
When is memoization automatic in GHC Haskell?
... and so is computed for each evaluation.
See the GHC wiki on CAFs: http://www.haskell.org/haskellwiki/Constant_applicative_form
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How can I generate a list of files with their absolute path in Linux?
....*
this for everything:
ls -d -1 "$PWD/"**/*
Taken from here
http://www.zsh.org/mla/users/2002/msg00033.html
In bash, ** is recursive if you enable shopt -s globstar.
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C++常用排序算法汇总 - C/C++ - 清泛网 - 专注C/C++及内核技术
...始，循环一次找出一个比首位小的值，交换
*
* https://www.tsingfun.com
************************************/
#include<stdio.h>
#include<stdlib.h>
/*
第一种形式的选择排序
选择排序后的顺序为从小到大
*/
void Select_Sort1(int *arr,int len)
{
int i,j...