Recent questions tagged JAVA

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java - How to get a random value from a string array in android?

In my values.xml file, I have an array, like this; <string-array name="animals-array"> <item>Cow</item> < ... is defined in the values.xml file? 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 - Calling Thread.sleep() with *interrupted status* set?

The Java documentation is not clear on this point. What happens if you call interrupt on a Thread before ... point to relevant documentation. 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 - Json Mapping Exception can not deserialize instance out of START_ARRAY token

I'm trying to parse my json request to my model. I don't know, what is wrong in this code. Syntax of json ... } ], "documentFormat": "PDF" } 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 meant by number of buckets in the HashMap?

I was reading about Hashmap. An instance of HashMap has two parameters that affect its performance: initial ... many objects can reside. 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 - JPA 2.0 : what is javax.validation.* package?

What is the javax.validation package in Java EE? How to use this with JPA? I want to validate my JPA Entity ... name; private long salary; ... 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 - Generics and the question mark

I'd like to use a generic list, but the initialization method only returns a List. The following code works well ... What is my mistake? 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 - Wait for multiple AsyncTask to complete

I am parallelizing my operation by splitting it in the exact number of cores available and then, by start the same ... operations. How can I 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 - Maven refuse to download aar packaged dependency from remote repository

I want to use this android dependency in my java program: http://jcenter.bintray.com/com/o3dr/android/dronekit- ... do to 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 - JPA entity has no primary key?

I have an Entity class: @Entity @Table(name="CMC_MAP_SERVER_INFO") @NamedQuery(name="CmcMapServerInfo.getMapServer", ... remove 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 - toResponse in jersey ExceptionMapper does not get invoked

So I'm building a web application, we are using JPA and Jersey to consume/produces JSON data. I have a ... .html#d4e435 What am I missing?? 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 access request in JspTags?

I want to call request.getContextPath() inside a JSP tag which extends SimpleTagSupport, is there any way to do 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 - ConcurrentHashMap locking

I have read somewhere that in ConcurrentHashMap, the whole map object is not locked and instead a lock is made on ... it only locking is 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 - Error on compiling query: The abstract schema type 'entity' is unknown

I'm developing a game with a database connection, and I use JPA to persist my data. Here is my Game entity : ... Application.java:21) ... 6 more 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 Sort Date in descending order From Arraylist Date in android?

I have an ArrayList which stores Dates and I sorted them in descending order. Now I want to display them in a ListView. ... <?> arg0) { } }); 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 efficient way to prevent an infinite recursion in toString()?

To string on a collection can get into a infinite loop if somewhere in the graph of collected items is a reference back to ... (); //BOOM ! } } See Question&Answers more detail:os...

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

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8.9k views

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java - JAXB Can't handle interfaces

I think this question has been asked like a million times, but none of solutions suggested worked for me. Here ... to figure out right solution 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 send an Image from Web Service in Spring

I am facing problem while sending an Image using Spring Web Service. I have written controller as below ... format to Android Client. 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 are switch expressions and how are they different from switch statements?

As part of Java SE 12, switch expressions were introduced and since Java SE 14, they have been ... different from switch statements? See Question&Answers more detail:os...

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

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353 views

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java - JPA Data Repositories with SqlResultSetMapping and native queries

I was stuck with the following situation: My entities are related to each other, but in such a way that i ... my question. 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 - Unmarshalling an XML using Xpath expression and jaxb

I am new to JAXB and would like to know if there is a way by which I can unmarshall an XML to my response ... /getter and setters .... } 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 - Got apache tomcat error that access denied on this file localhost_access_log.2014-08-30.txt?

I installed Apache tomcate on Windows 7 OS. I just installed apache and make it available in eclipse. When i run ... this??? Please help me. 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 - JUnit output in Maven reports

I am using Maven for my project and have following question: I want to see the logging output of my JUnit tests ... to achieve this? 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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438 views

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java - JDBC DatabaseMetaData.getColumns() returns duplicate columns

I'm busy on a piece of code to get alle the column names of a table from an Oracle database. ... getColumnLabel() instead of getColumnName(). See Question&Answers more detail:os...

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

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717 views

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java - Android : youtube player has been released

I'm getting this error Fatal Exception: java.lang.IllegalStateException This YouTubePlayer has been released , but ... Any callback ? 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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397 views

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java - Hibernate - hibernate.hbm2ddl.auto = validate

I am interested in how hibernate.hbm2ddl.auto=validate actually works and I am struggling to find comprehensive ... in a production system? See Question&Answers more detail:os...

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

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458 views

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java - Hibernate unknown entity (not missing @Entity or import javax.persistence.Entity )

I've got a really simple class: import javax.persistence.Column; import javax.persistence.Entity; import javax. ... > </hibernate-configuration> See Question&Answers more detail:os...

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

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222 views

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java - android disadvantages of not closing cursor

I have some questions regarding Cursor. I want to know what are the disadvantages of not closing a Cursor? It ... error in a log cat. See Question&Answers more detail:os...

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

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306 views

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java - Verifying JWT Signature using public key endpoint

I'm wanting to verify the signature of some JWTs from Microsoft. I'm using Spring-Boot, the JJWT ... documentation is appreciated 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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