Recent Posts
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ORM – non destructively delete entities in symfony2
Is there a good, clean and simple way to delete entities non destructively in symfony 2? I want the administrator to h…… -
Java – returns a string from JMS
I'm writing an independent main method that calls a producer (pushing data into a queue) and then calls a consumer who…… -
Java generics and wildcards are compiled in eclipse, but not in javac
As a follow-up Java genetics compile in eclipse, but not in javac, I released another code segment compiled and runnin…… -
java – Objects. Requirenonnull (t obj) instead of null check and throw illegalargumentexception manually?
Whenever I check whether the given parameter of a method is not null, if the null check fails, I use it to write a nul…… -
Java – what should developers know before developing mobile applications?
I want to start making Android mobile apps as my first choice, but not the only one I have 10 years of experience in J…… -
Java – recursive BeanUtils describe()
Is there a version of BeanUtils Describe (customer) recursively calls the describe () method to the complex attribute …… -
Java – how to use POI to set the author name as an excel file
I am using poi (Java) to create an excel (. Xlsx) file After I created the excel file, I saw the excel file as "Apache…… -
Severe: Java class not found util. Message body writer for ArrayList and mime media types application / JSON
I'm testing the restful service. When I execute, I get an exception. Although there are the following jars in my class…… -
How to store Java types and allow only some specific types?
Suppose I want to have a class descriptor for records, where each record has a set of properties Each attribute has a …… -
Java / Python communication via message broker
What is a good solution for communicating through a message broker that supports (c) Python and Java / JMS application…… -
Java – is there any way to force Maven to copy changes to the resource folder?
I use Maven 2.2 1 and M2 eclipse I have two resource folders When I save changes to any file in any resource folder, M…… -
Opencv enumeration variables (such as cv_bgr2gray or cv_aa) are missing from recent Java APIs?
I set up a java project in eclipse to detect faces and eyes in images Solution CV_ Bgr2gray shall be defined as imgpro…… -
Will JavaFX 8 implement text field validation support?
JavaFX 2 does not provide validation support (mask, input filtering, etc.) It is difficult to adopt technologies that …… -
Java – how to use Apache POI to select and bold the entire worksheet
I am a beginner of Apache POI library In VBA, I know I can use the following code to select and bold the entire worksh…… -
Java process memory grows infinitely Memory leak?
We have a java process running on Solaris 10, serving about 200-300 concurrent users Administrators have reported that…… -
Java – how do I associate a string with each member of an enumeration?
Suppose I have some enumerations as follows: enum Towns { Rome,Napoli,Modena } I want to associate a string with each …… -
Java – use Apache POI to read the contents of the drop-down list from excel
I need to create a drop-down list (data validation) on a specific cell in the excel worksheet and read it back With th…… -
Multiply by two vectors – I want a scalar, but I get a vector?
This is my code: a <-c(1,2,3) b <-t(a) print(a*b) I expect the result to be 14, because the multiplication of th…… -
Java – Maven plugin build failed when using Lambdas
I wrote a maven plugin / mojo to generate some code The plug-in runs well and has built-in Java JDK 1.8 I see some str…… -
Java – logger slf4j does not have the level configured with logback
My log record is through logback Configuration of logback using groovy files Now, when my Maven POM project aggregates…… -
Java – logger slf4j does not have the level configured with logback
My log record is through logback Configuration of logback using groovy files Now, when my Maven POM project aggregates…… -
Java – why are we in JSP instead of system out. Write out in println() println()？
I started learning JSP. I saw that if we want to print something in JSP, we must write out Println () instead of syste…… -
Java – why does jmh run different forks?
I use the jmh benchmark framework（ http://openjdk.java.net/projects/code-tools/jmh/ ）Run the benchmark on my code My…… -
Java – correctly handle long data in Hibernate
I received a problem that the data is too large in hibernate That's- Whether it is possible to automatically truncate …… -
Java string permutation and combination search
I am writing an Android word application My code includes a method that can find all combinations of strings and subst…… -
Java – which return type is used in the spring MVC of the @ requestmapping method?
I know that in spring, I can return the @ requestmapping method of MVC in @ controller >String > model > mode…… -
How to implement API / SPI pattern in Java?
I am creating a framework that exposes APIs for developers to use: public interface MyAPI { public void doSomeStuf…… -
The Java – freemaker template checks whether the sequence is empty
I want to check whether the sequence is empty in the freemaker template This fragment is used to check whether the seq…… -
Java – use comparisonchain for object equal()\u0026\u0026 Objects. Equal ()… What are the benefits of guava
I just started using Google's guava collection (comparisonchain and objects) In my POJO, I was waiting for the equals …… -
Java – unable to generate classes from JAXB in Maven environment
I used the xjc plug-in in the Maven environment and tried to generate classes from schema [ERROR] null[5,30] org.xml.s…… -
Java – get existing MapReduce jobs from the cluster (jobs can be run or completed)
Previously, I was using org apache. hadoop. mapred. Jobclient#getjob (org. Apache. Hadoop. Mapred. Jobid) get runningj…… -
Java – what does it mean to use proxies (dynamic proxies) in the spring framework?
I don't know what it means to use an agent in spring What is efficiency? Solution Dynamic proxy is a feature of JDK Yo……