Recent questions tagged java

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java - Hibernate exception _$$_javassist_0 cannot be cast to javassist.util.proxy.Proxy

Hello I am using developnig java web application and I am getting the next exception when I am trying to fetch data using ... tickets" sort="unsorted" table="TICKET"> <key> <column...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Throw a RuntimeException when invoking an unstubbed method

I'm using Mockito. I want to throw a RuntimeException when an unstubbed method is called. Is there any way to do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Jackson - How to specify a single implementation for interface-referenced deserialization?

I want to deserialize a JSON-Object with Jackson. Because the target is an interface I need to specify which ... the same. Is this possible? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What is the difference between FETCH and LOAD for Entity graph of JPA?

I'm new to JPA and I'm trying to use entity graph. And I realized when I retrieve data, I need to specify ... I need to use Fetch and Load? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Spring 3.0: Unable to locate Spring NamespaceHandler for XML schema namespace

My setup is fairly simple: I have a web front-end, back-end is spring-wired. I am using AOP to add a layer ... .11-jdk15.jar ./WEB-INF/web.xml See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to change default JRE for all Eclipse workspaces?

I have one JRE in C:Program Files (x86)Javajre6 and that was the only one at the time I installed Eclipse. ... all (at least new) workspaces See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Priority Queue remove complexity time

What is the complexity (big-oh) for the remove() function on the Priority Queue class in Java? I can't find ... it's O(logn). Any ideas? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to convert List to a JSON Object using GSON?

I have a List which I need to convert into JSON Object using GSON. My JSON Object has JSON Array in it. public ... is the best way to do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Strange syntax for instantiating an inner class

I didn't imagine that I would encounter radically new syntax in Java anymore at this stage, but lo and ... are non-abstract public classes. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - tools.jar seems to be not in Android Studio classpath on Windows 8

I installed Android Studio but it was giving me error that I need to install JDK but JDK was already installed. ... How do I fix this issue? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - JodaTime equivalent of DateUtils.truncate()

I have never used JodaTime before, but answering this question, How to get ordinal Weekdays in a Month. I tried ... to do that in JodaTime? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Using @Version in spring-data project

I've been working on a RESTful webservice with spring-data. A few days ago a special spring-data jpa REST ... to make use of @Version? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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338 views

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java - Can an enum have abstract methods?

Can an enum have abstract methods? If so, what is the use, and give a scenario which will illustrate this usage. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Convert Map to JSON using Jackson

How can I convert a Map to a valid JSON using Jackson? I am doing it using Google's GSON via a Spring ... about it the wrong way altogether? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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102 views

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java - Best way to get value from Collection by index

What is the best way to get value from java.util.Collection by index? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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427 views

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java - Spring: Returning empty HTTP Responses with ResponseEntity<Void> doesn't work

We are implementing a REST API with Spring (4.1.1.). For certain HTTP requests, we would like to ... .RemoteTestNG.main(RemoteTestNG.java:175) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Jackson JSON field mapping capitalization?

I'm not clear how jackson deals with capitalization in mapping fields. If anyone could help I'd appreciate it. { ... ; } ... et cetera See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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319 views

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java - How to set the Default Value of a ListPreference

i need to set the defult value for a ListPreference when the Activity starts. I've tried with ListPreference. ... one as default? Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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394 views

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java - Spring not autowiring in unit tests with JUnit

I test the following DAO with JUnit: @Repository public class MyDao { @Autowired private SessionFactory sessionFactory; // ... "->"JUnit test" See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - "RuntimeException: native typeface cannot be made" when loading font

I am attempting to use a custom font for a TextView on Android, following the guide here. Using the same ... preventing me from doing this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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470 views

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java - Private getter and public setter for a Kotlin property

How to make a property in Kotlin that has a private getter (or just do not have it) but has a public ... to call setStatus but not getStatus. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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387 views

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java - Error:Timeout waiting to lock buildscript class cache for build file when change minSdkVersion

I try to change minSdkVersion in build.gradle (Module: app) in Android Studio and get next error: Error: ... How to change minSdkVersion ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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227 views

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java - Correct set of dependencies for using Jackson mapper

I am new to Jackson and I was writing some code for practice. I found out the the new version of Jackson ... please tell me why is that? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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537 views

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java - spring security: NoSuchBeanDefinitionException: No qualifying bean of type [org.springframework.security.config.annotation.ObjectPostProcessor] found

I'm trying to add spring-security to my rest app. I followed the tutorial (https://spring.io/guides/tutorials/spring- ... .java:616) ... 56 more See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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102 views

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java - make ArrayList Read only

In Java, how can you make an ArrayList read-only (so that no one can add elements, edit, or delete elements) after initialization? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to put variable inside string-resources?

Is it possible to put variables inside string-resources? And if yes - how do i use them. What i need is the ... an int in place of the %X. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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350 views

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java - How can I check if an InputStream is empty without reading from it?

I want to know if an InputStream is empty, but without using the method read(). Is there a way to know if it's empty without reading from it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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367 views

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java - Extend and implement at the same time in Kotlin

In Java, you can do such thing as: class MyClass extends SuperClass implements MyInterface, ... Is it ... and does not implement MyInterface See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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