Recent questions tagged JAVA

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java - Difference between JavaBean and Spring bean

I am new to Spring MVC and have a little idea of the usage of java beans in Java. What is the basic ... between a Java bean and Spring bean? 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 debug spring application with gradle

I am working on spring app and need to step through a controller method to see how it works. I am ... -debug-jvm application doesn't start 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 can't JAXB find my jaxb.index when running inside Apache Felix?

It's right there, in the package that it should be indexing. Still, when I call JAXBContext jc = JAXBContext. ... little out of my depth here. 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 - Difference between system.gc() and runtime.gc()

What is the difference between System.gc() and Runtime.gc()? 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 - Transaction rollback on SQLException using new try-with-resources block

I have a problem with try-with-resources and I am asking just to be sure. Can I use it, if I need ... the resources declared have been closed." 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 - close fxml window by code, javafx

I need to close the current fxml window by code in the controller I know stage.close() or stage.hide() ... will be greatly appreciated. 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 serious is the Java7 "Solr/Lucene" bug?

Apparently Java7 has some nasty bug regarding loop optimization: Google search. From the reports and bug descriptions ... to avoid the 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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java - Intellij IDEA. Hide .iml files

I use Intellij IDEA 12 and I want to hide .iml files in Project view. How I can achieve 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 - Why is "int i = 2147483647 + 1;" OK, but "byte b = 127 + 1;" is not compilable?

Why is int i = 2147483647 + 1; OK, but byte b = 127 + 1; is not compilable? 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 Gesture Recognition using Accelerometers

My goal is to recognize simple gestures from accelerometers mounted on a sun spot. A gesture could be as simple ... works more leave a comment. 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 cache results of a Spring Data JPA query method without using query cache?

I have a Spring Boot app with Spring Data JPA (hibernate backend) repository classes. I've added a couple ... doing wrong here? PLEASE HELP! 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 - Inject spring bean dynamically

In a java-spring web-app I would like to be able to dynamically inject beans. For example I have an ... maybe using a setter injection?). 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 Security 5 Replacement for OAuth2RestTemplate

In spring-security-oauth2:2.4.0.RELEASE classes such as OAuth2RestTemplate, OAuth2ProtectedResourceDetails and ... my application? 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 anyone explain thread monitors and wait?

Someone at work just asked for the reasoning behind having to wrap a wait inside a synchronized. Honestly I ... understand what was going on. 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 encrypt a string/stream with bouncycastle pgp without starting with a file

I need to encrypt a stream with pgp using the bouncycastle provider. All of the examples I can find are about taking a ... ) + "'"); } } 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 - How to find which jars and in what order are loaded by a classloader?

I could not find a clear answer to this question elsewhere, so I'll try here: Is there some way ( ... that were loaded by this classloader. See Question&Answers more detail:os...

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

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375 views

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java - Android spinner Data Binding using XML and show the selected values

I am using the new android data binding and it works great. I am able to perform data binding using EditText, TextView ... this.type = type; } } See Question&Answers more detail:os...

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

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301 views

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java - ExecutorService vs ThreadPoolExecutor using LinkedBlockingQueue

I am working on a multithreaded project in which I need to spawn multiple threads to measure the end to end ... anyone clarify this for me? 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 - Overriding beans in Integration tests

For my Spring-Boot app I provide a RestTemplate though a @Configuration file so I can add sensible defaults(ex ... mock(RestTemplate.class) } } 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 an AssertionError? In which case should I throw it from my own code?

In Item 2 of the "Effective Java, 2nd edition" book, there is this snippet of code, in which the author wants ... I'm doing the right thing. See Question&Answers more detail:os...

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

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130 views

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java - What is the difference between SOAP 1.1, SOAP 1.2, HTTP GET & HTTP POST methods for Android?

I am working on a code for SOAP Web services, I would like to know the variations in SOAP 1.1, SOAP 1.2, ... its usage URL or its code. 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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944 views

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java - HMAC-SHA256 Algorithm for signature calculation

I am trying to create a signature using the HMAC-SHA256 algorithm and this is my code. I am using US ASCII ... be I can improve my 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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232 views

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java - What's the difference between HashSet and Set?

Saw the code snippet like Set<Record> instances = new HashSet<Record>(); I am wondering if Hashset is a ... set. Any difference between them? 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 Json and null values

How can I detect when a json value is null? for example: [{"username":null},{"username":"null"}] The first ... ? false bye=null is null? false 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 rename a Hashmap key?

I'm looking for a way to rename a Hashmap key, but i don't know if it's possible 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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106 views

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java - Intellij IDEA crashed, and now throws an error

I work in Intellij IDEA, but my computer freezes so I turn off my computer. (long click power button) When I ... How can I fix 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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193 views

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java - How to get Month Name from Calendar?

Is there a oneliner to get the name of the month when we know int monthNumber = calendar.get(Calendar.MONTH) Or what is the easiest way? See Question&Answers more detail:os...

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

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243 views

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java - How to run JUnit tests with Gradle?

Currently I have the following build.gradle file: apply plugin: 'java' sourceSets { main { java { srcDir 'src/ ... the folders of tests/model? See Question&Answers more detail:os...

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

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