Recent questions tagged JAVA

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java - Apache Camel - Triggering a task on startup to run only once

I am working on a Java project using Camel & Spring. We would like to trigger an initialize method on a ... Camel startup is complete? 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 - How to rotate log files based on time rather than size in Log4j?

I use Log4j with the RollingFileAppender to create a log rotation based on size. How can I configure it to log ... to a log4j.properties 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 - Special characters in an enum

I want to put the special characters, the parentheses ( '(' and ')' ) and the apostrophe ('), in an enum. ... I solve this? Grtz me.eatCookie(); 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 - Barcode Scanning, Options? Zxing?

I want to create an application for Android that will be able to scan barcodes, get the information ... download a secondary application? 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 - SerializationPolicy error when performing RPC from within GWT application

I'm getting the following exception: com.google.gwt.user.client.rpc.SerializationException: Type 'java.lang. ... it in the SerializationPolicy? 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 - org.hibernate.MappingException: Unknown entity

I'm trying to work through Beginning Hibernate 2nd edition, and I'm stuck trying to put together the simple ... classpath.base"/> </target> 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 - Register shutDownHook in web application

How we can registerShutdown hook in web application? Is there any whays to register it in web.xml or ... ? As it uses ContextListener 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 - Running Android emulator on computer with AMD processor

Is there anyway to run Android virtual devices through Eclipse while operating with AMD processor? I had Genymotion for ... to dabble with 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 - JPA and default locking mode

With JPA, we can use manually OPTIMISTIC or PESSIMISTIC locking to handle entity changes in transactions. I wonder ... integrity be lost? 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 - Playframework JSR-303 validated "field" does not have a corresponding accessor for data binding

When I have added this following code to my project Form<User> filledForm2 = userSignupForm.bindFromRequest(); It ... in java play framework? 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 - Cucumber Test a Spring Boot Application

Does anyone know where I can find a sample application where Cucumber is used to test a Spring Boot application ... would be acceptable 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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java - How to tell proguard to keep enum constants and fields

I've try obfuscate our web application which use spring, jaxb and relies on annotations, and reflection heavily. ... (class.getFields()). 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 - set a property only if the value is not null

When using Spring, is it possible to set a property only if the value passed is not null? Example: < ... a more intelligent solution existed. 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 - NullPointerException in FragmentManager

I'm using the Android compatibility library and occasionally get a weird NullPointerException: java.lang. ... in a ViewPager. 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 manually start a transaction on a shared EntityManager in Spring?

I have a LocalContainerEntityManagerFactoryBean as EntityManager instance. To quickly drop a full tables' content, I ... (emf); } 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 - Where/how does log4j look for a log4j.properties file?

I'm trying out log4j in a simple test app. I create a new Java project in eclipse and add the log4j ... log4j to load my configuration 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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361 views

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java - Multiple Clickable links in TextView on Android

I'm trying to add multiple links in a textview similar to what Google & Flipboard has done below with their ... in the two examples below? 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 - Lombok @Builder inheritance workaround

Lombok @Builder doesn't work for inheritance use cases: For example class Foo{ protected int xyz1; ..... ... Is there a better workaround ? 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 - Getting error org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'springSecurityFilterChain' is defined

I am running NTLM using Spring Security, I am getting the following error org.springframework.beans.factory. ... /bean> </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 - Dynamically get the current line number

Is there a way in Java to dynamically get the current line number through reflection or some awesome API? Just ... log.error() method call. See Question&Answers more detail:os...

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

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208 views

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java - Android How can I Convert a String to a Editable

We all know we can setText(String) to an editText box but if you want to get an editable variable ... = editablevariable.getText().toString() 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 do my RabbitMQ channels keep closing?

I'm debugging some Java code that uses Apache POI to pull data out of Microsoft Office documents. ... basicPublish call inside publish. See Question&Answers more detail:os...

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

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217 views

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java - Remove multiple elements from ArrayList

I have a bunch of indexes and I want to remove elements at these indexes from an ArrayList. I can't do a ... removal. How do I solve 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 - JDBC insert multiple rows

I am now using batch: String query = "INSERT INTO table (id, name, value) VALUES (?, ?, ?)"; ... .prepareStatement(query); ps.executeUpdate(); 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 implementation detail makes this code fail so easily?

This question is not about the well-known and documented fact that HashMap is not thread-safe, but about its specific ... map(m::get).count(); 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 - Eclipse: The declared package does not match the expected package

I have a problem importing an external project. I go File -> Import... -> Existing Projects into Workspace, choose ... Or what else 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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323 views

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java - How can I use certificate authentication with HttpsURLConnection?

I'm trying to connect to an HTTPS URL, but I need to use client authentication with a certificate placed on my ... with needles, just in case. See Question&Answers more detail:os...

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

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475 views

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java - Polymorphism in JSON, Jersey and Jackson

Does Jackson with Jersey support polymorphic classes over JSON? Let's say, for instance, that I've got a Parent ... 'm working with Spring MVC. See Question&Answers more detail:os...

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

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