Recent questions tagged Java

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I have been trying to set up my android to begin my development lessons all day without success. I have installed ... ". Can someone 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 - Why are Phantom References not cleared as they are enqueued?

We can see that "phantom reachable" is as unreachable as "unreachable": § An object is phantom reachable if it ... case of Java API quirk? 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 - Is there any difference between Objects::nonNull and x -> x != null?

Consider the following class: import java.util.Objects; import java.util.function.Predicate; public class LambdaVsMethodRef ... 't prove much. 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 - onDestroy() while "waiting" for onActivityResult()

I have an app with two activities: "A" and "B". "A" uses startActivityForResult() to spawn "B" i.e. ... waiting for the result of a subactivity. 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 - After upgrade android version getting "Duplicate class android.support.v4.app.INotificationSideChannel"

before android update 3.4 my application run perfectly but after upgrade android my application getting merging ... -jdk7:$kotlin_version" } 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 - Is a JVM stopped while executing jmap?

Does my java application continue running while jmap is taking its memory dump? 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 do I know the id before saving an object in jpa

I have a new object. I want to know id before saving it. Is it possible? Or there is another way for ... getId); jpaDao.saveOrUpdate(entity); } 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 - Log4J Custom Fields

Introduction: I'm trying to get additional fields to log with log4j, and its working but only when I ... .layout.ConversionPattern=%X{Version} 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 stop "JavaFX Application Thread"

I have a simple console application which sometimes need to perform graphics operations, for those I'm using JavaFx ... Linux Fedora 16 64bit. 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 - Is there a way to delete meta-data on Eclipse run configurations?

I may have a corruption problem in Eclipse run configurations. This happened after I dragged (or copy-pasted, ... and a launch 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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java - Hibernate interceptor and event listeners

I wonder if it's possible to find out what hibernate really did to the database (i.e., committed ... , 3. nearly perfectly undiscoverable. 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 - Restarting Play application Docker container results in 'This application is already running' - RUNNING_PID is not deleted

Edit: There is a related issue being discussed on Github but in another mode of deployment (Typesafe Activator ... stopping a Play 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 - httpOnly Session Cookie + Servlet 3.0 (e.g. Glassfish v3)

By default, Glassfish v3 doesn't set the httpOnly flag on session cookies (when created as usual with request.getSession() ... e.g. in web.xml. 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: Dirty Checking and Only Update of Dirty Attributes?

In the "good old JDBC days" I wrote a lot of SQL code that did very targeted updates of only the " ... not what single member is dirty.) 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 - DynamoDBMapper for conditional saves

I'm using DynamoDBMapper and would like to conditionally save if and only if the hashkey and range key ... may be doing incorrectly? See Question&Answers more detail:os...

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

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310 views

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java - URLConnection does not get the charset

I'm using URL.openConnection() to download something from a server. The server says Content-Type: text/plain; ... ) returns null. What 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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java - Cannot make a static reference to the non-static field memberVariable with private variable

I created a enum with one private member variable. When i try to access the member variable the compiles states ' ... int addValue(int value); } 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 position of View in onCreateViewHolder

I am using a RecyclerView with a single row layout with an ImageView and a TextView. I want to implement a ... .id.comment); } } } See Question&Answers more detail:os...

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

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312 views

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java - Spring @Value("${}") often null

I'm using Spring Boot application. In some @Component class @Value fields are loaded, instead on other classes ... Have you some suggestion? 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 - Removing all items of a given value from a hashmap

So I have a java hashmap like below: hMap.put("1", "One"); hMap.put("2", "Two"); hMap.put("3", " ... to remove them all, how can this be done? See Question&Answers more detail:os...

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

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370 views

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java - How to Print treemap in reverse order

In my assignment we are read from a file the text: To be, or not to be: that is the question: Whether 'tis nobler ... >1)return 1; return 0; } } See Question&Answers more detail:os...

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

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486 views

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java - ArrayList Retrieve object by Id

Suppose I have an ArrayList<Account> of my custom Objects which is very simple. For example: class Account { ... there must be better way. See Question&Answers more detail:os...

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

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326 views

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java - Spring Environment backed by Typesafe Config

I want to use typesafe config (HOCON config files) in my project, which facilitate easy and organized application ... .getAnyRef(name); } } See Question&Answers more detail:os...

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

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256 views

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java - Eclipse buildpath automatically taking all JARs of a internal directory

How do I configure my project buildpath to have a set of .jar files located in the same directory automatically ... I am using Eclipse 3.4 See Question&Answers more detail:os...

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

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391 views

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java - Apache Commons FTPClient.listFiles

I am using org.apache.commons.net.ftp.FTPClient in one of my applications to work with a FTP server. I am able ... ); } } client.disconnect(); See Question&Answers more detail:os...

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

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238 views

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java - How can I convert a Timestamp into either Date or DateTime object?

I'm retrieving a timestamp object from a database using ResultSet.getTimestamp(), but I'd like an easy way to get the date ... ... .... } .... See Question&Answers more detail:os...

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

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263 views

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java - Is there a mysql JDBC that will respect fetchSize?

I am using MySQL and want to utilize the setFetchSize property. The default MySQL JDBC implementation does not ... of sql queries required. See Question&Answers more detail:os...

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

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311 views

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java - Hello World Android App, Error: workspaceappcompat_v7 esvalues-v21styles_base.xml No resource found that matches the given name

I am a totally newbie who just got into Android development. I am going through the "Building your first app" ... [2014-10-22 17:13:53 - MyFirstApp] C:UsersCliffworkspaceappcompat...

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

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