Recent questions tagged java

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java - XStream : node with attributes and text node?

I would like to serialize an object to an XML of this form with XStream. <node att="value">text</node> ... a converter for this object? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to set up multiple source folders within a single Eclipse project?

I have several somewhat separate programs, that conceptually can fit into a single project. However, I'm having ... not contain Java code.) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Migrating from log4j to log4j2 - properties file configuration

I have a java application which is using log4j configured as below. log4j.properties log4j.rootLogger=INFO, R ... the same configuration above ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - how to define an inverse cascade delete on a many-to-one mapping in hibernate

I have two classes A and B. Many B's can have association with a single A, hence a many-to-one relationship ... to write anything in A for this. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Create custom operation for setDefaultCloseOperation?

I want to make my Java Application to call my own custom made function when the "close" cross button is pressed ... how this can be achieved? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to read and write a HashMap to a file?

I have the following HashMap: HashMap<String,Object> fileObj = new HashMap<String,Object>(); ArrayList<String> cols ... there is data). Thanks, See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Can a final variable be initialized when an object is created?

how it can be possible that we can initialize the final variable of the class at the creation time of the object ? ... how is it possible ? ... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Resolving entity URI in custom controller (Spring HATEOAS)

I have a project based on spring-data-rest and also it has some custom endpoints. For sending POST data I'm ... do not have product.Id value. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - JPA: Foreign key that is also a primary key mapping

I have been trying to solve this for whole day but no luck! Also i tried to read most of the tutorials on the ... for this One to one case ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Spring Data REST in plain JSON (not HAL format)

How exactly should Spring Data Rest be configured to return plain JSON instead of HAL (JSON with Hypermedia like ... format for spring-data-rest See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Why do threads spontaneously awake from wait()?

I was wondering why threads spontaneously awake from wait() in java. Is it a design decision? Is it a compromise ... only from false to true. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Howto design for extension

There is a Checkstyle rule DesignForExtension. It says: if you have a public/protected method which is not abstract ... extension in this case? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - JsonPath JUnit escape character for dots

I have a json field which is called template.welcome.email and I am writing a unit test that checks if ... escape character for the jsonPath? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to delay a loop in android without using thread.sleep?

I wanted to delay a for loop without using Thread.sleep because that method make my whole application hang. ... which ImageButton turn first. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to Avoid Lock wait timeout exceeded exception.?

java.sql.SQLException: Lock wait timeout exceeded; try restarting tra nsaction at com.mysql.jdbc.SQLError.createSQLException( ... solve it..?? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Is there a way to dynamically choose a @GeneratedValue strategy using JPA annotations and Hibernate?

I am working on a product that will be supporting multiple database engines (Oracle, MSSQL, MySQL). For ... choose the strategy at runtime? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Elegantly handling constraint violations in EJB/JPA environment?

I'm working with EJB and JPA on a Glassfish v3 app server. I have an Entity class where I'm ... with useless exception information? Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Is string concatenaion really that slow?

I'm currently looking into String concat options and the penalty they have on the overall performance. And my ... is this supposed to happen? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Why do System.nanoTime() and System.currentTimeMillis() drift apart so rapidly?

For diagnostic purposes, I want to be able to detect changes in the system time-of-day clock in a long-running ... not 1 msec on most systems. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to Convert an Android Library Project to an External JAR?

I have an Android library project that has been working for me pretty well, but now I am interested in ... are the restrictions or limitations? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - string decode utf-8

How can I decode an utf-8 string with android? I tried with this commands but output is the same of input: URLDecoder. ... hello&//à", "utf-8"); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - When does JVM decide to reuse old lambda?

Consider the following code fragment: public static Object o = new Object(); public static Callable x1() { Object x ... where do reuse or not? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java just curly braces

I was reading a book and there were a few example with programs that has just curly braces for example public static void ... { //some code } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Upgrade from Tomcat 8.0.39 to 8.0.41 results in 'failed to scan' errors

I have a Spring Boot WAR application perfectly working under Tomcat 8.0.39 on AWS. After issuing sudo service ... a jar's manifest file. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How can I programmatically test an HTTP connection?

Using Java, how can I test that a URL is contactable, and returns a valid response? http://stackoverflow.com/about See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Jackson: how to serialize only annotated properties

I would like to define my custom serialization strategy (which fields to include), while using Jackson. I know ... properties and nothing more? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - MVC with javaFX

I'm struggling with the MVC concept using javaFX. I am building an javaFX application using fxml files. Each fxml ... set e.g. actionListeners? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Join comma if not empty or null

I saw this answer of how to join String[] to comma separated string. However I need the util to join the string in ... , u will be: I love u See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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