Recent questions tagged JAVA

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java - Where do I specify Jackson SerializationConfig.Feature settings in Spring 3.1

I'm puzzled as to why using a default inclusion of jackson that Spring seems to have customised the default ... mappings to timestamp for now. 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 are the other NaN values?

The documentation for java.lang.Double.NaN says that it is A constant holding a Not-a-Number (NaN) value of type ... .isNaN(x) are both true. 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 - Modifying headers for every request after processing (in postHandle)

What I want to do is, adding a new header to the response after the request is processed. I need to check ... way to accomplish this easy task? 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 - IllegalArgumentException: expecting IdClass mapping

During deploying my app I occurs on that exception. I have a lot of class in my app and I dont know where I must to ... :1.0.2.GA] ... 3 more 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 - Could not find or load main class com.sun.tools.javac.Main hadoop mapreduce

I am trying to learn MapReduce but I am a little lost right now. http://hadoop.apache.org/docs/r2.6.0/hadoop- ... a set of Java tools? Not sure 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 configure JAXB so it trims whitespaces when unmarshalling tag value?

How to configure JAXB unmarshaller so it will trim leading and trailing whitespaces from strings? For instance let's ... 1</number> </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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java - How can I pass string path param containing slash character?

I have this REST resource: @GET @Path("{business},{year},{sample}") @Produces(MediaType.APPLICATION_JSON) public ... , but 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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java - Auto resize the widths of JTable's columns dynamically

I have a JTable with 3 columns: - No. # - Name - PhoneNumber I want to make specific width for each column ... you help me solving this issue? 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 using a JMX server with ephemeral port, how to get the server port number?

When launching a Java application with these options: -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote ... within the 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 - Joda Time - different between timezones

I want to convert the current time to the time in a specific timezone with Joda time. Is there a way ... do time.minusHours or time.plusHours? 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 - HTTP Status 405 - Request method 'PUT' not supported

I have the following controller: @RestController public class RestaurantController { ... springframework.security.web.header.writers.HstsHeaderWriter$SecureRequestMatcher@3ded3d8a...

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

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java - Understanding Groovy/Grails classloader leak

Yesterday I deployed my first Grails (2.3.6) app to a dev server and began monitoring it. I just ... particularly troublesome for the PermGen? 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 - Reordering JList with Drag and Drop

I encountered a problem regarding reordering elements in a JList using Drag and Drop. This following code is a ... the second one 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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268 views

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java - Spring security not hitting default-target-url after successful authtication

I have implemented spring-security in my application, my spring-security.xml has following form- ... of authticationSuccessHandler. 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 - Fix screen orientation for 1 page only (phonegap)

I am having an issue with fixing the screen orientation for my index.html page only. I want to allow the app ... 1 page only? 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 - Bypass GeneratedValue in Hibernate

Is it possible to bypass @GeneratedValue for an ID in Hibernate, we have a case where, most of the time we want ... . Is this possible to 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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java - javac "no source files" when using -h option

I'm trying to experiment with using the JNI and JDK 9. I have a class NativeTest.java that looks like this: ... this yet? What am I missing? 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 - Setting Arabic numbering system locale doesn't show Arabic numbers

I read this article: JDK 8 and JRE 8 Supported Locales, it stated that: Numbering systems can be specified by ... to apply it on 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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java - How to get the in-memory size of an object in Android, or performance benchmarks?

Long story short, I want to test my clone implementation of the android.os.Bundle class against that class to see ... simplest way to do 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 - regex to find numbers with unique digits

I want to find 10 digit numbers with no repeat digits, for example: 1123456789 //fail, there are two 1's ... a better way to achieve 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 - Hibernate - PropertyNotFoundException: Could not find a getter for

I have a class that looks like the following: public class MyClass { private String dPart1; public String getDPart1() ... How should I fix 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 - document not saving in spring jpa document manager application

I am developing a document management application in spring using jpa and MySQL. The application is currently ... MySQL database using jpa? 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 way to create a primitive array without initialization?

As we know Java always initialises arrays upon creation. I.e. new int[1000000] always returns an array with ... way to avoid this intialization? 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 the current time and date on a 24 hour timescale

I am having problems getting the current time on a 24 hour timescale. As far as I know, "HH" should represent ... to do. Help's 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 - Why base class(not implementing Serializable) should have no argument constructor if its subclass implements Serializable?

I am reading the docs of interface Serializable,in which i find the following lines: To allow subtypes of non- ... the state of the object? 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 does the JVM consume less memory than -Xms specified?

My question is as the title, and I got some knowledge by searching: linux has shared memory How to measure actual ... -**Xms128m** -Xmx128m Test 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 - Efficient BigDecimal round Up and down to two decimals

In java am trying to find an efficient way to round a BigDecimal to two decimals, Up or Down based on ... efficient way to accomplish 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 check if JSONArray Element is null

I can't figure out how to determine is an element that lives inside a json array is null. To check if the ... new Date(date.getTime()); } See Question&Answers more detail:os...

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

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