Recent questions tagged Java

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I have a parent class class A and a child class class C extends A. A a=new A(); C c=(C)a; This gives me ... ones in C or the ones in class B? 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 - Show image from database. Getting net.sf.jasperreports.engine.JRException: Image read failed

I'm trying to pull an image as binary data from my database and insert it into a Jasper Reports report. Using ... , but the image is blank. 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 - Disable drag of JFrame

I want to ask how to make frame can not drag when the application is running? And then how to disable maximize, ... bar)? I'm using JFrame. 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 - Add a line chart beneath an existing pie chart

When I click on a section of my piechart, I would like to see under first chart another chart (line chart). ... pie: This is my final result: 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 - Issue with NoClassDefFoundError error in a web environment Spring/Wicket/Derby/Jetty

I am trying to build a simple JDBC Spring Template application, the web framework I am using is wicket and under the ... xml-apis-1.0.b2.jar 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 - Can't access synthetica themes on new netbeans 7.4 with latest JDK (1.7.0_45)

Today i was update my Netbeans 6.8 to new Netbeans 7.4 and JDK 1.7.0 to 1.7.0_45 When i open my ... i resolve this ? 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 - Adding more text to a cell in table in itext

I am trying to add some text with a bar code in a table cell using itext as per the following code but ... (paragraph); cell.setPadding(10); 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 - Blank PDF while downloading

I am facing a very strange issue, I am trying to send the PDF file as attachment from my struts application using ... 1.x, jBoss6, iReport 1.2 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 - Cannot find or load oracle.jdbc.driver.OracleDriver

I have installed Oracle 11.2 and Java: java version "1.7.0_09" Java(TM) SE Runtime Environment (build ... find oracle.jdbc.driver.OracleDriver ? 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 - SEVERE: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component

I m new in Spring Boot, i trid to make simple application, i deployed war on tomcat, but i ... ].StandardContext[]] at org.apache.catalina.core.ContainerBase.addChildInterna...

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

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431 views

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java - hyperjaxb3 not generating files

I am trying to learn hyperjaxb by studying this tutorial. I followed all of the instructions down to the heading ... What else can I try? 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 - Updating elasticsearch entities with bulk

I have this database data as below (ES 7.xx) version { "id":"1234", "expirationDate":"17343234234", "paths" ... .of("index")); } } See Question&Answers more detail:os...

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

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503 views

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java - Suppress empty parameters using param tag

I have written JSP that I used with many actions. It has a link with parameters The link: <s:a namespace="/ ... :42) How to solve 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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418 views

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java - Converting Hex answer to Dec?

I need some help in converting the answers I get from my OBD adapter in my car to decimal and then later ... tomorrow, but would this work? See Question&Answers more detail:os...

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

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534 views

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java - MenuButton doesn't display items in Javafx

I have a class Foo which just load the FXML and create the scene. In the FXML, I set the controller to ... in menuButton defined in the FXML? See Question&Answers more detail:os...

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

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490 views

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java - How do I call functions in fragment from another?

I put two fragments in an activity. What I want to do is to hide a view from say fragment A when I ... a null pointer exception...please help See Question&Answers more detail:os...

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

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565 views

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java - Spring Integration - Externalizing JDBC Queries

Is there a simple way to externalize big sql queries from jdbc outbound gateways, instead of inlining it? The ... used inside the bean. See Question&Answers more detail:os...

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

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560 views

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java - Good pattern for creating an object that supports interning?

I need a Class that supports interning, like Java's String class. When creating an instance of the Class ... objects and values are parameters? 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 - Trouble setting a column comparator to a JTable

In another thread I found this comparator (bottom of post) for sorting JTable columns that could be composed of integers, ... } } } } } }; 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 transfer sharedpreferences file from internal storage to external storage?

How to copy sharedpreferences to external storage keeping xml format, so later it could be possible to ... to transfer `sharedpreferences. See Question&Answers more detail:os...

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

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507 views

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java - re-size JTable when useing Default table model

I have a JTable built using DefaultModel which is displayed in JPane but I would like to re-size the table to make ... } but it did not work. See Question&Answers more detail:os...

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

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552 views

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java - Capture the soundcard's output?

I'm trying to get the data that the soundcard is outputting. Unfortunately, from my understanding of the Java ... confusing, just woke up. See Question&Answers more detail:os...

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

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552 views

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java - Sending a blob to a servlet through ajax

EDIT: The whole problem turned out to be a network issue, but if you see any ideas on how I could optimize ... 'd be grateful for any pointers. See Question&Answers more detail:os...

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

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560 views

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java - Delayed text color change in Swing text field

Is it possible to change the color of a text in a text field?I am trying to build an interpreter, so I was ... a few seconds. Is it possible? 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 criteria count over with group by

I have a spring app with the user entity and the users table. I would like to get a number of all users ... the result of the group by clause See Question&Answers more detail:os...

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

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446 views

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java - What is a better alternative to valueEventListener for retrieving data from firebase database?

My Firebase database is like that - users - first user ID - name - "abc" - image - "url" - one_word - " ... method but it is still 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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479 views

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java - How to download file via Ajax with HTTP POST (i.e. some info in body)?

Download popup dialog can be displayed by window.location = "someUrl" or just simply have a link that send HTTP GET ... ); }//end post25() See Question&Answers more detail:os...

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

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775 views

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java - JSF, validateRegex and & (ampersand)

I want to test inputText field to see if its content matches anything but at least one & (ampersand). ... inputText doesn't appear 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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