Recent questions tagged java

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java - HQL ERROR: Path expected for join

I keep trying variations of this query and can't seem to make this happen. I've also referenced this post: Path Expected for Join! Nhibernate Error and ... ug.group_id = :groupId ORDER BY u.lastname" ) 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 - EJB @Schedule wait until method completed

I want to write a back-ground job (EJB 3.1), which executes every minute. For this I use the following annotation: @Schedule(minute = "*/1 ... the scheduler if the current execution is not completed? 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 - Android 3.1 USB-Host - BroadcastReceiver does not receive USB_DEVICE_ATTACHED

I worked through the description and samples for USB host at developer.android.com to detect attached and detached USB-devices. If I use an intent-filter ... Tab A500 Android: 3.1 Thanks in advance 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 RequestMapping for controllers that produce and consume JSON

With multiple Spring controllers that consume and produce application/json, my code is littered with long annotations like: @RequestMapping(value = "/foo", ... I get the appropriate Content-Type headers. 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 - Does Hibernate Fully Support SQLite

Jboss Hibernate doesn't say anything about the support for SQLite - https://community.jboss.org/wiki/SupportedDatabases2 And same is mentioned in below SO: ... be embedded and is part of the jdk. 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 - Support for Compressed Strings being Dropped in HotSpot JVM?

On this Oracle page Java HotSpot VM Options, it lists -XX:+UseCompressedStrings as being available and on by default. However in Java 6 update 29, it ... and with compressed string requires only 1.0 GB. 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 - Why default constructor is required in a parent class if it has an argument-ed constructor?

Why default constructor is required(explicitly) in a parent class if it has an argumented constructor class A { A(int i){ } } class B extends A { } class Main { ... = new B(); } } This will be an error. 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 blur background images in Android

What is the best way to blur background images like the image below? I saw some code and libraries but their are a couple of years old or like ... doesn't give the same effect. Thanks in advance! 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 - JPA entity without id

I have a database with the following structure: CREATE TABLE entity ( id SERIAL, name VARCHAR(255), PRIMARY KEY (id) ); CREATE TABLE entity_property ... that will work with database schema like 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 - When onBindViewHolder is called and how it works?

I am a beginner and I am having trouble with understanding a piece of code. Can someone please explain me when this function evoke and what is ... ); holder.theClassName = currentdata.getTheClassName(); } 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 - Algid parse error, not a sequence

When trying to read a RSA private key from a file using the method public PrivateKey getPrivateKey() throws NoSuchAlgorithmException, InvalidKeySpecException, ... does this error mean? Thanks Dmitri 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 - No serializer found for class org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor

When i try to navigate to an endpoint i get the following error Type definition error: [simple type, class org.hibernate.proxy.pojo. ... 'm returning ResponseEntity<RestResponse<PagedResponse<Product>>> 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 default .equals and .hashCode will work for my classes?

Say I have my own class public class MyObj { /* ... */ } It has some attributes and methods. It DOES NOT implement equals, DOES NOT implement ... easy, but what about equals() and hashCode() methods? 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 send a stacktrace to log4j?

Say you catch an exception and get the following on the standard output (like, say, the console) if you do a e.printStackTrace() : java.io.FileNotFoundException: ... -- What goes here? log.error( s ); } 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 - Why does Spring MVC need at least two contexts?

In Spring MVC, there are two contexts. One is the application context or global context which is booted up by ContextLoaderListener. It takes all the ... only one context when using spring mvc? 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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java - Android encryption

I am working on an android application, and I need to use encryption for one aspect of it. I am really indifferent to which algorithm I use (AES, ... an example on how to do an encrypt/decrypt function? 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 text content to Image

Is there out any Java library that allows converting text content to image files? I only know of ImageMagick (JMagick in this case) but I wouldn't like ... ", I would like to generate this simple image: 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 - Could not commit JPA transaction: Transaction marked as rollbackOnly

I'm using Spring and Hibernate in one of the applications that I'm working on and I've got a problem with handling of transactions. I've got ... but why is the rollback crashing with an exception? 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 bash, how do you make a classpath out of all files in a directory?

This will be a really simple freebie for a bash guru: Question Using bash, how do you make a classpath out of all files in a directory? Details ... is a simple way to accomplish this via bash script? 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 - Running the same JUnit test case multiple time with different data

Is there there any way to tell JUnit to run a specific test case multiple times with different data continuously before going on to the next test case? 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 - Regex: what is InCombiningDiacriticalMarks?

The following code is very well known to convert accented chars into plain Text: Normalizer.normalize(text, Normalizer.Form.NFD).replaceAll("\p{ ... of it? (and similars?) 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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java - How to save a BufferedImage as a File

I am using the imgscalr Java library to resize an image . The result of a resize() method call is a BufferedImage object. I now want to save this ... -> File but perhaps this is not the correct approach? 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 EhCache in Spring 4 without XML

Is there a way to initialize EhCache without xml in either Spring 4 or with Spring Boot? I noticed Spring Boot 1.0.0.RC3 doesn' ... initializeBean(AbstractAutowireCapableBeanFactory.java:1549) ... 15 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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java - Android drawable speech bubble

I've looked for days and can not find any good leads on how I can draw a bubble or where a draw 9 patch images is to use as a background. i am a ... How to draw a "speech bubble" on an iPhone? Thank you 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 - Hibernate Criteria Query to get specific columns

I am using Criteria Query in my code. It always fires select * from ... Instead I want to neglect one column(field) from my query as that field have large ... But I don't know how to modify it in HQL? 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 - Configure active profile in SpringBoot via Maven

I'm trying to set an active profile in Spring Boot application using Maven 3. In my pom.xml I set default active profile and property spring. ... set using Maven profile? Any help highly appreciated. 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 - Find a jar file given the class name?

This must be a very basic question for Java developers, but what is the best way to find the appropriate jar file given a class name? For example, ... I happen to be on a windows machine without cygwin. 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 - Maven error :Perhaps you are running on a JRE rather than a JDK?

I've never worked with Maven before and I am following the instructions here. When I run the command mvn integration-test -Pamp-to-war It initially downloaded a ... -xr-x 4 root root 4096 Oct 13 2013 man See Question&Answers more detail:os...

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

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