Recent questions tagged Java

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java - Getting EasyMock mock objects to throw Exceptions

I'm in process of using EasyMock to write Unit tests for a number of collaborating classes. One of ... EasyMock before? References EasyMock API 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 - No bean resolver registered in the context to resolve access to bean

I'm trying to implement method security using Java Config, but I'm getting a error:- org.springframework.expression. ... Spring security 3.2.7 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 Gradle `options.bootClasspath` in an os independent manner?

Because my Java sources and targets must be JRE 1.6 compatible, I need to set options.bootClasspath to a path that ... + "jce.jar" } } 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 - Incompatible initial and maximum heap sizes specified

I got this Error when I run a java class which has an NLP library .... Error occurred during initialization of VM ... i can solve this error :) 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 change the property path in a ConstraintValidator for Method arguments?

If you are familiar with the Bean Validation Framework you know that you cannot get the name of a method argument. So ... password ) { ... } 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 make loop infinite with "x <= y && x >= y && x != y"?

I had this interview question some years ago but I haven't found the answer yet. What should be x and y to ... ,infinity+/-,null float vs int. 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 ObjectMapper cannot deserialize POJO, throws an exception: No suitable constructor found for type [...]: can not instantiate from JSON object

I have tried to test the following code with no success: class TestClass { private class ND2Customer { public String ... do 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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java - Jar file naming conventions

Are there any industry standard conventions for naming jar files? 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 get the compact form of pretty-printed JSON code?

How do I make Jackson's build() method pretty-print its JSON output? Here is an example that pretty-prints the ... that. What else can be done? 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 Specifying @Transactional rollbackFor Also Include RuntimeException

@Transactional(rollbackFor = MyCheckedException.class) public void foo() { throw new RuntimeException(); } Will this ... the annotation as well? 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 - Guice injecting Generic type

I'am trying to Inject generic type with Guice. I have Repository< T > which is located in the Cursor class. public ... there a way to do 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 - Deserializing JSON with Jackson - Why JsonMappingException "No suitable constructor"?

I have a problem deserializing a JSON string using Jackson (but I have no problem serializing an object to JSON) ... ; public int UserId; } 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 - Null check vs Optional is present check

Can someone explain how Optional helps us avoid NullPointerException? Optional<String> op = someFunc() if(op.isPresent ... a return value 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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170 views

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java - Can someone explain how to use FastTags

There are two ways to create customs tags with the play framework. By defining a groovy template in app/view/ ... The latest is NOT documented. 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 - R: Cannot install rJava; what is r-api-3.4?

I am on an Ubuntu 18.04 machine with R version 3.5.1, installed following this link. I am trying to install ... why do I still see errors then? See Question&Answers more detail:os...

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

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432 views

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java - Quartz Scheduler suddenly stop running and no exception error

I have some quartz job which was running everyday at 7pm. Suddenly it failed to run. I check my server.log ... be the issue? Thanks in advance 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 - Any way to set max size of a collection?

is there any way to set maximum size of collection 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 - javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist

Using JPA with Hibernate, I got an exception when running the following code. The first time I run it, everything ... 7.0.32 server. Any idea? See Question&Answers more detail:...

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

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java - How do I read POST parameters for a RESTful service using Jersey?

I am not using JSON or anything like that. I have a simple form to upload a file and I want to read the ... return Response.ok().build(); } 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 - GUID to ByteArray

I just wrote this code to convert a GUID into a byte array. Can anyone shoot any holes in it or suggest ... .nextBytes(bytes); return bytes; } See Question&Answers more detail:os...

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

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198 views

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java - Spring AOP works without @EnableAspectJAutoProxy?

I am learning Spring (currently its AOP framework). Even though all sources I've read say that to enable ... public class TestComponent { } See Question&Answers more detail:os...

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

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334 views

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java - Hibernate Envers: Initializing Envers Proxies

In Hibernate Envers, all related collections of an entity are loaded lazily, regardless of what fetch type is set. ... using Hibernate 3.5.6. 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 - Connection cannot be null when 'hibernate.dialect' not set

having more issues with seting up hibernate with spring3. this time it is saying ... .springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.c...

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

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242 views

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java - getColumnLabel vs. getColumnName

What is the difference between ResultSetMetaData.getColumnLabel and ResultSetMetaData.getColumnName? Label: Gets the ... is determined? 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 doesn't the Scala List have a size field?

Coming from a Java background, I'm wondering why List in Scala doesn't have a size field like its Java ... List, not the mutable one.) See Question&Answers more detail:os...

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

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461 views

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java - Create an array with n copies of the same value/object?

I want to create an array of size n with the same value at every index in the array. What's the best way ... false, false, false, false, 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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298 views

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java - Javadoc displaying value on an inner class constant using @value

I have an inner class which declares a constant and want to display its value in Javadoc of the enclosing top- ... other class, in general)? See Question&Answers more detail:os...

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

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419 views

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java - Why is a single underscore character an illegal name for a lambda parameter?

I tried naming a lambda parameter _, e.g. (a cut down version): Consumer<Object> c = _ -> ... the single-underscore name specifically forbidden? See Question&Answers more detail:os...

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

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