Recent questions tagged JAVA

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java - Wait until tomcat finishes starting up

I have a script that needs to run after tomcat has finished starting up and is ready to start deploying ... tomcat has finished starting up? 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 lifecycle and concurrency semantics of Rhino Script Engine

I am interested in the lifecycle and concurrency semantics of (Rhino) Script Engine and associated classes. Specifically ... up in the bindings? See Question&Answers more detail:os...

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

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480 views

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java - Spring Boot - How to disable @Cacheable during development?

I'm looking for 2 things: How to disable all caching during development with Spring boot "dev" profile. ... want to over-complicate things. 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 difference between localname and qname?

When using SAX to parse an XML file in Java, what is the difference between the parameters localname and ... qName, Attributes attributes)? 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 to use javax.inject.Provider in Spring?

What it does is pretty simple: @Inject private Provider<ProductService> productService; The Product service is ... usage of Providers? See Question&Answers more detail:os...

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

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385 views

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java - javax.validation.ValidationException: Unable to find default provider

I am currently working on Spring MVC web app and trying to hook up validation using the @Valid annotation. When ... class path? Cheers, Caps 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 enable session and set session timeout in Spring Security

I am new to Spring Security and I am working on a login, logout, and session timeout feature. I have ... doing it fully based on annotation. 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 - Springboot: org.hibernate.MappingException: Could not get constructor for org.hibernate.persister.entity.SingleTableEntityPersister

I know, it is duplicate question,but problem is new, Please do not mark duplicate question. This program runs in Window 10 ... 5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframew...

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

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java - What is the preferred Throwable to use in a private utility class constructor?

Effective Java (Second Edition), Item 4, discusses using private constructors to enforce noninstantiability. Here ... and standards perspective. 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 find the IP Address of Client connected to Server?

My client pc is connected to as server pc via sockets over Ethernet, How do I find the IP of this client from ... passed it to a new Thread). See Question&Answers more detail:os...

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

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404 views

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java - Conversion of DTO to entity and vice-versa

I am using Spring MVC architecture with JPA in my web application. Where to convert data transfer object (DTO ... without using any framework)? 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 - HashMap with Null Key and Null Value

Consider the following Code : import java.util.*; class Employee { String name; public Employee(String nm) { this. ... to be like the same key. See Question&Answers more detail:os...

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

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204 views

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java - RxJava Single.just() vs Single.fromCallable()?

I wondered if someone can shed some light on this question, when to use Single.fromCallable( ()-> myObject ) ... documentation: Just</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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502 views

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java - Why HATEOAS starts creating issue for spring-boot version >= 2.2.x during startup with Swagger 2.x?

I moved my project from spring-boot 2.1.9 to 2.2.0. While starting the project, I am facing the ... springfox.version}</version> </dependency> See Question&Answers more detail:os...

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

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430 views

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java - maven-javadoc-plugin breaks mvn release:perform

I'm trying to execute mvn release:perform on three projects that I have released to our Nexus server many times in ... don't have any problems? See Question&Answers more detail:os...

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

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454 views

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java - Why is v2/api-docs the default URL when using springfox and Swagger2?

I'm just starting using swagger following this guide, but I found out something very weird that makes no sense ... someone help me with 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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387 views

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java - JSF 2 - How can I get a context-param value from web.xml using JSF EL?

I would like to declare some constant values used by my JSF 2 webapp inside the web.xml file like so: <web-app ... JSF EL to get the 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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216 views

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java - Trying to check if a file exists in internal storage

The following code is how I am trying to identify if a file exists in the internal storage, MODE_PRIVATE. public ... t do the return. Why? See Question&Answers more detail:os...

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

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141 views

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java properties to json

Is there an easy way to convert properties with dot notation to json I.E server.host=foo.bar server.port=1234 TO { " ... .bar", "port": 1234 } } See Question&Answers more detail:os...

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

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167 views

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java - How to set response header in spring mvc

I have a method in which i want to set response header cache-control and pragma :- public String addUser(@Valid ... dont know how to use 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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195 views

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java - Android project won't build when editing a resource file

I have an Android 1.5 project in Eclipse and whenever I merely have an xml resource file open the build dies ... figure out what the cause was. See Question&Answers more detail:os...

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

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119 views

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java - Use cases for implementing annotations

What are valid use cases for implementing annotations? When designing primarily annotation based configuration systems I ... cases in mind? See Question&Answers more detail:os...

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

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231 views

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java - Could not read JSON: Can not deserialize instance of hello.Country[] out of START_OBJECT token

I have rest url that gives me all countries - http://api.geonames.org/countryInfoJSON?username=volodiaL. I use ... of array into Country 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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555 views

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java - Skipped breakpoint because it happened inside debugger evaluation - Intellij IDEA

When I try to pick a breakpoint on any executive line of any method of my project, and I know that ... -Dcom.sun.management.jmxremote.ssl=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 - JPA thinks I'm deleting a detached object

I've got a DAO that I used to load and save my domain objects using JPA. I finally managed to get the ... me what I'm doing wrong 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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287 views

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java - JUnit expected tag not working as expected

I have the following test case in eclipse, using JUnit 4 which is refusing to pass. What could be wrong ... expected without luck. Screenshot: See Question&Answers more detail:os...

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

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120 views

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java - Make directory in android

Im trying to build a directory called "images" on the SD card on android. This is my code but its not ... /images"); picDirectory.mkdirs(); See Question&Answers more detail:os...

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

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530 views

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java - HashSet vs ArrayList contains performance

When processing large amounts of data I often find myself doing the following: HashSet<String> set = ... possibilities clearly more efficient? See Question&Answers more detail:os...

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

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