Recent questions tagged Java

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java - How do I convert a Joda Time DateTime object into a String in SQL Server format?

I am using the Joda-Time library in Java, and have a date and time stored as an org.joda.time.DateTime ... it in an INSERT SQL statement? 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 - CustomDeserializer has no default (no arg) constructor

I am consuming a REST Api with RestTemplate. The response I'm getting from the API has lots of nested objects. ... as much context as 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 - How do you send data in a Request body using HttpURLConnection?

I am using HttpURLConnection to make a POST request to a local service deployed locally and created using JAVA Spark ... (); } } } 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 criteria for many to many relationship

I have 2 POJO classes in Java, Answer and Collaborator, in a many-to-many relationship. class Answer { @ManyToMany( ... to give to the join. 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 the Spring equivalent for CDI's Instance, or Guices Provider

In CDI you can define an object that will give you items of a certain type, using: @Inject Instance<MyObject> ... order to get the reference? 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 - Read embedded object in Jackson

I'm trying to read a legacy JSON code using Jackson 2.0-RC3, however I'm stuck with an "embedded" object. ... the entire Item object that 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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java - Gradle Multi-Module Project Setup

I've recently started using Gradle and replacing my existing Maven-based projects. I have had many issues in the ... for the community. 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 do I connect to multiple databases using JPA?

I have an application using Java servlets/JSP's. There are multiple clients using my app, however each client ... unitName at runtime? 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 - System.currenTimeInMillis() vs System.nanoTime()

I know that System.nanoTime() is now the preferred method for measuring time over System.currentTimeInMillis() . The ... -time clock " mean ? 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 - Populating a HashMap with entries from a properties file

I want to populate a HashMap using the Properties class. I want to load the entries in the .propeties file and ... object to a HashMap 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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350 views

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java - Gmail returns 534-5.7.14 Please log in via your web browser

I found this error while i'm trying to send an email from one Gmail account to another. How to ... answer/78754 hw7sm51688135pac.12 - gsmtp 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 - Which pattern does Hibernate follow?

In his book "Patterns of Enterprise Application Architecture", Martin Fowler talks about persistence patterns which are ... to most closely? 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 move operation in Unix atomic?

Suppose there are 2 processes P1 and P2, and they access a shared file Foo.txt. Suppose P2 is reading from Foo ... 's something I'm missing out. 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 - Saving certificate chain in a pkcs12 keystore

The following code: //used Bouncy Castle provider for keyStore keyStore.setKeyEntry(alias, (Key)keyPair.getPrivate() ... ; return certificate; } 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 is this method overloading ambiguous?

public class Primitive { void m(Number b, Number ... a) {} // widening, autoboxing->widening->varargs void m( ... not happen. Can u plz explain? 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 - Difference between System.getProperty("line.separator"); and " "?

While developing GUI with Java FX, I seem to get different results with System.getProperty("line.separator"); ... basically is the difference? 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 is library module android.support.test not visible in add dependency

I am adding Espresso to my project in Android Studio. I have installed the Support Repository and in ... reinstalling Support Repository twice. 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 to use CharSequence in an API

I'm designing a public interface (API) for a package. I wonder, should I use CharSequence generally instead of ... in a hash-based container)? 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 - Obtaining "MessageBodyWriter not found for media type=application/json" trying to send JSON object through JAX-RS web service

I am trying to send a JSON object through a JAX-RS web service. My file web.xml is: <servlet> < ... Any help would be much 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 - @PreAuthorize annotation not working spring security

I found many similar questions but none has solved my problem. My problem is ROLE_USER can access functions of ... ; return "deleteUsers"; } 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 does @PrepareForTest in PowerMock really mean?

What does the annotation @PrepareForTest in PowerMockito really mean? What should be placed there apart of classes which have static methods? 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: pattern for handling OptimisticLockException

What is the correct pattern for handling OLE in a (REST) web service? this is what I'm doing now, for example, ... , even if it takes a while. 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 - Immersive fullscreen on Android 11

Before, to enable immersive fullscreen mode, you'd have to use setSystemUiVisibility, like so: getWindow(). ... what's the 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 - Android 4.4 WebView file chooser not opening?

We are creating an app which uses the webview and will access a page where the user needs to upload a file. ... Has anyone managed to do 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 - How to capture System.exit event?

I have an application in java, in which i try to ensure that the if anybody exits codes System.exit() ... , any suggestion/approach is welcome. 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 the idiomatic Hamcrest pattern to assert that each element of an iterable matches a given matcher?

Examine the following snippet: assertThat( Arrays.asList("1x", "2x", "3x", "4z"), not(hasItem(not(endsWith("x") ... that doesn't end with "x" 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 add element into ArrayList in HashMap

How to add element into ArrayList in HashMap? HashMap<String, ArrayList<Item>> Items = new HashMap<String, ArrayList<Item>>(); 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 create date object using a value string

I am using this to get the current time : java.util.Calendar cal = java.util.Calendar.getInstance(); System. ... to you using system.out.println See Question&Answers more detail:os...

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

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