Recent questions tagged Java

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java - Why does the defaultWriteObject function have to be called first when writing into an ObjectOutputStream?

When I read the about the Serializable interface in Thinking in java, there is a sentence that says: If you ... what condition could it occur ? 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 - Retrofit 2.0 beta1: how to post raw String body

I am looking for some way to post request with raw body with new Retrofit 2.0b1. Something like this: @POST("/ ... not help in 2.0 anymore. 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: accessDeniedHandler does not work

I've got the following Spring Security configuration: @Configuration @EnableWebSecurity public class WebSecurityConfig ... access failure? 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 getView() in ArrayAdapter is called

When creating a customized adapter for ListView in android, I see that I have to create a class the extends ... getView() is being called ? 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 - Memory Leak from iterating Opencv frames

I am using the java wrapper of OpenCV. I tried to write an Iterator over frames of a film. My problem is ... 's obviously not what was intended. 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 - Retrieve the fragment (hash) from a URL and inject the values into the bean

I am looking for a way to inject values from the fragment (#) of a URL into bean(JSF), in the same ... the URL fragments into server side beans? 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 - Select using hibernate

I saw few examples over internet of Hibernate using transaction.commit() for select statements. Below is ... transaction for select statement? 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 - Find selected item of a JList and display it in real time

I have a JList, where i am displaying some ID's. I want to capture the ID the user clicked and dis play ... to click buttons to fire an action) 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 - Most effective way to write File to ServletOutputStream

ServletOutputStream output = response.getOutputStream(); output.write(byte[]); What is the most effective way to write ... if the NIO was used? 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 - List<Map<String,Object>> to org.json.JSONObject?

List<Map<String, Object>> list = new ArrayList<Map<String, Object>>(); Map<String, Object> map = new HashMap< ... output is: {"empty": 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 - Adding vertical scroll to a JPopupMenu?

I would like to add a way to scroll through menu items in a JPopupMenu, much like scrolling through a list ... unless I really have to. 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 - Resolve multiple SLF4J bindings in maven project

This is a question sounds like bunch of similar questions on SE sites, so I should be quite verbose to ... of slf4j reachable during execution? 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 - Google App Engine - automatic-scaling with always on instance?

One of the most irritating things about using GAE for a brand new app is having to deal with instances being fired ... is useable to new users. 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 connect to Chromium Headless using Selenium

I would like to use chromium headless for automated testing using selenium. (https://chromium.googlesource.com/ ... segmentation vaults ;-) 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 - JOOQ & transactions

I've been reading about transactions & jooq but I struggle to see how to implement it in practice. Let's say I ... not sure how to go about 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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java - Do I have to use "package" term in every class?

Firstly, I'm trying to learn Java with Java, A Beginner's Guide, 4th Edition. I use Ubuntu as my OS and ... what I need to know about 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 - Android Navigation Drawer on multiple Activities

Is there a way to configure only one time the Navigation Drawer, and the display it on multiple Activites? 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 - JOptionPane without button

I need to present a information message that needs to be in the screen for 5 seconds, during this time, user ... that the dialog have no button? See Question&Answers more detail:os...

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

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314 views

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java - Using Java8 Streams to create a list of objects from another two lists

I have the following Java6 and Java8 code: List<ObjectType1> lst1 = // a list of ObjectType1 objects List< ... more concise way using Lambda? 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 - AuthenticationSuccessHandler in Spring Security

I've used spring security in a Spring Boot application and there are 2 types of users: one is an ... Injection of autowired dependencies failed; 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 validate an XML against schema using JAXB?

I am working with XML and JAXB as I am unmarshalling and marshalling the XML into Java objects and vice versa. ... \ap\versionOne\test.xsd")); See Question&Answers more detail:os...

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

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225 views

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java - Does the JVM create a mutex for every object in order to implement the 'synchronized' keyword? If not, how?

As a C++ programmer becoming more familiar with Java, it's a little odd to me to see language level ... know if the same limitations apply. 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 my Service work in Android? (I just want to log something ever 5 seconds)

I created a new class called HelloService. I added this to the Android manifest.xml. public class HelloService ... ="HelloService"></service> 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 - Jersey Exception mappers not working when jackson deserialization fails

I am using Jersey 2.10 with Jackson serialization/deserialization feature in my REST API. My idea is to make ... .JacksonFeature.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 - how to marshal a JAXB object to org.w3c.dom.Document?

This gives me a Document object with a top level node with no child nodes: public static Document getDocument( ... I'm trying to accomplish? See Question&Answers more detail:os...

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

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368 views

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java - JVM crashes with error='Cannot allocate memory' (errno=12)

My code crashes with this error message Executing "/usr/bin/java com.utils.BotFilter" OpenJDK 64-Bit Server ... kB DirectMap1G: 95420416 kB 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: The request sent by the client was syntactically incorrect ()

Hi I received next error during the redirect: The request sent by the client was syntactically incorrect URL which ... of the second 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 - How to create an auto-generated Date/timestamp field in a Play! / JPA?

I'd like to add a Date/DateTime/Timestamp field on an entity object, that will be automatically created when the ... this in Play! / JPA? See Question&Answers more detail:os...

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

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