Recent questions tagged java

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java - In spring mvc how to get the context path in controller

I need application context path in controller, I tried the below code its throwing NULLPOINTER EXCEPTION. ... Please help me 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 Show or Read docx file

I am new to rendering files in android, and I want to render or display a docx file in my application. I had ... some success message } } } } 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 - JAXB List Tag creating inner class

So we have an XSD type in the form: <xs:complexType name="Foo"> <xs:all> <xs:element name="Bars"> ... Foo while still retaining the XML 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 - Use different paths for public and private resources Jersey + Spring boot

I'm using Spring boot + Jersey + Spring security, I want to have public and private endpoints, I want an ... Thanks for your 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 - Collections emptyList/singleton/singletonList/List/Set toArray

Suppose I have this code: String[] left = { "1", "2" }; String[] leftNew = Collections.emptyList(). ... ? Can someone shed some light 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 - javafx: How to bind the Enter key to a button and fire off an event when it is clicked?

Basically, I have a okayButton that sits in a stage and when it is clicked , it performs a list of tasks. Now ... to achieve what I want to do. 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 parse non-standard month names with DateTimeFormatter

I need to parse (German) dates that come in the following form: 10. Jan. 18:14 8. Feb. 19:02 1. M ... a custom locale or something like 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 - Log4J creates log file but does not write to it

I'm trying to configure log4j to log messages to a file. Right now, the file does get created with the name I ... m using log4j version 1.2.17. 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 - ProGuard doesn't obfuscate JAR with dependencies

I have a project with the pom.xml file given below. When I issue the command mvn clean compile assembly:single ... messages can be seen 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 - How to create play heroku procfile?

I am following the directions here http://blog.heroku.com/archives/2011/8/29/play/ but I do play run ... values for %prod in application.conf? 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 - ClassCastException: org.springframework.orm.jpa.EntityManagerHolder cannot be cast to org.springframework.orm.hibernate5.SessionHolder

I try to create simple user login and registration page. But I cannot create user using services method. I ... .web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:124) ~[spri...

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

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java - shutdown hook vs finalizer method

I just fail to understand why must one use Runtime.addShutdownHook. If you want to do some cleanup when ... run before garbage collections. 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 - A ResourcePool could not acquire a resource from its primary factory or source

I'm trying to connect to a database in Java, using jdbcTemplate and I'm gettin the error below. I have Googled ... ... } return queryList; } 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 Boot programmatic logging configuration

How can I configure logging programmatically in a spring boot application? Using an xml or properties file is not ... ? It makes no sense. 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 - ProGuard keep class name but change package name

want to change package name but need keep Class Name not change. any idea? 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 do I force a polymorphic call to the super method?

I have an init method that is used and overridden through out an extensive heirarchy. Each init call however ... call super. TYFT ~Aedon 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 - Cannot use comparable with father-son-grandson inheritance

Given the following code : public abstract class Participant { private String fullName; public Participant(String ... I doing wrong ? 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 - "Could not find the main class: XX. Program will exit."

I have managed to run my jar file with a command prompt, but its always giving me a reponse of Could not find ... . Please help me out, 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 - Mocking Reflection based calls

I am trying to mock some reflection based methods. Below you can see the details, Class Under Test public class ... can be tested? 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 - What is the best way to 'ping' a database via JDBC?

I'm trying to determine the best way to ping a database via JDBC. By 'best' I mean fast and low ... test the validity of the connection. 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 simple image with text inside?

I need to create simple image in my application programmatically. Simple image will have black background with text ... . 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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333 views

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java - Implementing Comparable, compareTo name clash: "have the same erasure, yet neither overrides the other"

I'd like to have a compareTo method that takes a Real (a class for working with arbitrarily large and precise ... this(other.toString()); } 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 - SQL 'LIKE' operator in Hibernate Criteria API

I want to implement some universal filter with Hibernate Criteria. It should work like LIKE operator from SQL: SELECT ... a way to resolve 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 - GcmListenerService.onMessageReceived() not called

I'm currently working on implementing GCM notifications into my app. The problem that I'm having is that the ... not the best at explaining. 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 - org.springframework.web.client.HttpClientErrorException: 400 Bad Request

I'm using spring boot. I have a rest api POST call that I need to send the body using x-www- ... .handleInternal(RequestMappingHandlerAdapter.java:729) [spring-webmvc-4.2.2.RELEA...

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

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java - Scala Error: Could not find or load main class in both Scala IDE and Eclipse

Here is my problem, I know there are lots of answers for similar questions, however none of them worked after I ... be any errors in the 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 - Can't instantiate javax.servlet.ServletException

I am trying to create instance of class javax.servlet.ServletException with following code public class MyTroubleViewer { ... am I doing wrong? See Question&Answers more detail:os...

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

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622 views

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java - How to use RxJava combineLatest operator with more than 9 observables

I'm using RxJava and I want to combine 12 different observables using the operator combineLatest. I saw a ... someone show me an example? See Question&Answers more detail:os...

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

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