Recent questions tagged JAVA

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java - What does "optional operation" mean in Javadoc of for example Set#add(E)?

When in the java documentation for Set it says in the specification of a method Optional Operation e.g. ( ... by that implementation of 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 - What's the point of beans?

I've bean doing some JSP tutorials and I don't understand what the point of a bean class is. All it is, is get and ... ) %><BR> </BODY> </HTML> 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 - Hibernate HQL issue expecting IDENT found "*"

I need to go whole datas from relative table so I'm using somethink like this (i would use it in sql) ... datas from column R with hibernate? 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 alternatives are there to Hibernate Validator's @SafeHtml to validate Strings?

As stated in the JavaDocs, it will be removed in a future release. Is there any alternative library which works similarly via annotations? 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 - JavaFX - getScene() returns null

I just started using JavaFX Scene Builder to build a small application. It is made up of a controller class 'Login. ... > What am I doing wrong? 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 - AppCompatActivity not implementing LifecycleOwner

I am using Android Support Library 26.1.0. These are the dependencies in app module - implementation "android. ... new MutableLiveData<>(); } 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 - Iterating HashMap on order it has been set

I've set a HashMap on certain order but it is iterated on a strange order! Please consider code below: ... Any help will be appreciated. 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 change jsessionid cookie path to server root in Spring app on Jetty?

I have a Jetty server running a Spring app on the /app context. The app uses sessions, so it sets a session ... </configuration> ... </plugin> 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 programmatically setup a <security-constraint> in Servlets 3.x?

In my current web application I am trying to get rid of web.xml and I have not been able to properly ... does not reference any specific servlet 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 - Open EXISTING xls in Apache POI

I have an existing file (C:wb.xls) that I want to open and make changes to. How in Apachie POI do ... file or how to autoformat column widths? See Question&Answers more detail:os...

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

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385 views

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java - How to break a while loop from an if condition inside the while loop?

I want to break a while loop of the format below which has an if statement. If that if statement is true, ... if condition and while loop } } 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 - The return of String.intern() explained

Consider: String s1 = new StringBuilder("Cattie").append(" & Doggie").toString(); System.out.println(s1. ... get all the interned strings. 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 fails to parse POMs at jenkins

I have this simple maven project, containing a few common test tools. It builds locally, but on jenkins I am ... ... 16 more Finished: 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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385 views

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java - Access Outer Class this instance

how do we access outer class this instance: eg in Class A { Class B { this.helloB(); (A's this).hello() ... we access A's this instance 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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618 views

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java - How do I work with JavaFX in Eclipse Juno?

I have installed jdk1.7.0_15. JavaFX's download page says the following: JavaFX 2.2.7 contains the latest ... help me get started with JavaFX See Question&Answers more detail:os...

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

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455 views

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java - JPA with JTA: Persist entity and merge cascaded child entities

I have a bidirectional one-to-many relationship with the following entity classes: 0 or 1 client <-> 0 or ... (no vendor-specific 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 - Insert row into database with PreparedStatement

I want to insert a row into a table using PreparedStatement. The table got 3 columns(int, String, String). The ... ! It's an MySQL database. See Question&Answers more detail:os...

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

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417 views

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java - split("\") and error

String str = "u0054u0068u0069u006eu006bu0050u0061u0064"; String[] strArray = str.split(""); but this error occured. ... error near index 1 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 is an unassigned expression a valid statement?

I've read Oracle's expressions tutorial and couldn't understand this. It is well known that the following line of ... as a Java line of code? 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 - Sorting a LinkedHashSet

I'm wondering if it's possible to sort a LinkedHashSet. I've tried the statement Collections.sort((List< ... I use another Data Structure? See Question&Answers more detail:os...

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

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499 views

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java - Can't define a private static final variable because it throws an exception

I have a class like: public class SomeClassImpl implements SomeClass { private static final SomeLib someLib = new ... find anything on 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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727 views

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java - FileNotFoundException (permission denied) when trying to write file to sdcard in Android

As you can notice from title, I have a problem with writing file to sdcard in Android. I've checked this ... public space in sdcard anymore or? 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 - 'Failed to find style mapViewStyle' error persists

I've been working on this app for almost a year now (senior project) when it just decided to break a ... highly appreciate any help 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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334 views

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java - How to determine the order of listeners in web.xml

I got a bunch of servlet context listeners in my Java webapp, each of them gathering some information about the ... I can solve my 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 - Logback configuration via jvm argument

How can we load logback.xml via jvm argument if this is not present in project classpath? I'm using -Dlogback. ... xml but this is not working. See Question&Answers more detail:os...

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

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572 views

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java - Why does 0.06 + 0.01 = 0.07 in ColdFusion?

Why don't math operations in ColdFusion seem to be affected by floating point math issues? Take the code: ... at an isolated anomaly here? See Question&Answers more detail:os...

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

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544 views

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java - How to retrieve JSON Response from a javax.ws.rs.core.Response response?

I am making a request to an API and getting a response status code of 200. Response of the api includes ... from the web client response? See Question&Answers more detail:os...

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

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415 views

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java - Can 0.99999999999 be rounded to 1.0 when multiplying?

When multiplying a floating point number that is very close to 1 with an int > 0, can it ever be ... prompted me to ask this question. See Question&Answers more detail:os...

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

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