Recent questions tagged Java

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I am tying to erase the last line in a text file using Java; however, the code below deletes everything. public ... .printStackTrace(); } } } } 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 - What difference between app-inf and web-inf folders in JavaEE applications?

Can you give me understanding of main difference between APP-INF and WEB-INF folders in javaEE applications. 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 - MultipleBagFetchException thrown by Hibernate

I want to have an option in my repository layer to eager load entites, so I tried adding a method that ... be eager loaded with all relations? 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 - Does creating an instance of a child class automatically create its super class object?

If I create an object of sub class then will the super class object also be created from which the sub class ... and creates a Thread object? 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 - Solve PermGen errors when building in IntelliJ with Maven?

If I get PermGen OutOfMemoryError from the app server when building my project in IntelliJ with Maven, is it ... the project with maven. 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 find dominant color of an image?

Can we find which color is dominant in an image with using java,imagemagick or jmagick? 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 make this rxjava zip to run in parallel?

I have a sleep method for simulating a long running process. private void sleep() { try { Thread.sleep(2000); } ... } return strings; } }; } 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 - JOptionPane Yes or No window

I am trying to create a message with a Yes or No button. Then a window will appear with a certain message ... GOODBYE when the user chooses No? 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 - Implementing multiple interfaces having same method

This code works perfectly. The method test() works for both interfaces. What is exactly going on under the hood? And how ... new C(); b.test(); 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 - Http Post With Body

i have sent method in objective-c of sending http post and in the body i put a string: NSString *requestBody = [ ... set the body of http post. 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 figure out what is holding on to unfreed objects?

One of our programs is sometimes getting an OutOfMemory error on one user's machine, but of course not when I' ... in JProfiler if there are. 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 - What is the limit to the amount of data that can be encrypted with RSA?

Typically it is recommended that RSA be used to encrypt a symmetric key, which is then used to encrypt the ... Castle crypto libraries in Java. 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 - Oracle / JDBC: retrieving TIMESTAMP WITH TIME ZONE value in ISO 8601 format

A lot have been said (and written on SO) on parts of the subject, but not in a comprehensive, complete way ... for good answers everyone, B. 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 - Screen on/off broadcast listener for a widget on Android Oreo

I have a clock widget Android app which I am now trying to update to API 26 requirements. Up to now I ... my question 1 still remains valid. 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 it possible to update only a subset of attributes on an entity using Spring MVC with JPA?

I'm working with Spring Roo, using Spring MVC and JPA for persistence with a MySQL database. I'm very ... (): user.mergeWithExistingAndUpdate(); 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 I (and how) lookup CDI managed beans using javax.naming.Context#lookup in EJB module?

Can I (and if so, how?) lookup CDI managed beans using javax.naming.Context#lookup in EJB module? I'm using ... so I can't use @Inject. See Question&Answers more detail:os...

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

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382 views

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java - Serialize bi-directional JPA entities to JSON with jackson

I'm using Jackson to serialize my JPA model into JSON. I have the following classes: import com.fasterxml.jackson. ... a way to solve 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 - How to do blending in LibGDX

I basically want to play around with blending modes in LibGDX but don't know how to do it. I found this image ... .draw(batch, parentAlpha); } } See Question&Answers more detail:os...

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

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296 views

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java - lucene good practice and thread safety

i'm using lucene to index documents and perform a search after which, i immediately delete them. all this can ... appreciated. thanks a lot! 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 - Android Spannablecontent With Rounded Corners

I am trying to change my string to make a badge with a number in the middle by using Spannable ... ); myMenuRow.setText(spannablecontent); See Question&Answers more detail:os...

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

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616 views

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java - How does double dispatch work in Visitor pattern?

I was looking into other questions related to the visitor pattern but couldn't understand the implementation of ... in the Visitor pattern? See Question&Answers more detail:os...

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

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532 views

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java - Is it possible to debug GWT client code on a REMOTE server using IntelliJ 9 Community Edition?

I'm trying to move our Google Web Toolkit (GWT) development from Eclipse to IntelliJ 9 Community edition. So far ... see my own answer below... 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 - What does the double wildcard (*) on a servlet mapping url-pattern mean?

I'm wondering what is the difference of using a single or double wildcards to describe a url-pattern on a ... more 'directories' in a path See Question&Answers more detail:os...

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

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465 views

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java - Received fatal alert: bad_certificate

I am trying to setup a SSL Socket connection (and am doing the following on the client) I generate a Certificte ... java:197) ... 32 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 - How to programmatically create bean definition with injected properties?

I want to programmatically add a bean definition to an application context, but some properties of that definition are ... m using Spring 3.0. See Question&Answers more detail:os...

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

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193 views

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java - GZIP compression to a byte array

I am trying to write a class that can compress data. The below code fails (no exception is thrown, but the target .gz ... (Exception e){ } } } } See Question&Answers more detail:os...

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

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258 views

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java - ACTIVEMQ- publisher subscriber hello world example

There are two programs: subscriber and publisher... Subscriber is able to put the message onto the topic and ... me to overcome this problem? See Question&Answers more detail:os...

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

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263 views

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java - Parsing a chemical formula

I'm trying to write a method for an app that takes a chemical formula like "CH3COOH" and returns some ... some other brilliant simple 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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