Recent questions tagged java

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java - How to use Jackson's TypeReference with generics?

For json mapping I use the following method: public static <T> T mapJsonToObject(String json, T dtoClass) throws ... possible? And How? 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 - Raw type. References to generic types should be parameterized

I have a Cage class: public class Cage<T extends Animal> { // the construtor takes in an integer as an ... stuck about this tricky syntax :o( 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 - Attempt to invoke virtual method

I am trying to get some LinearLayoutsin my onCreateView but my App is crashing with the following message: 23430-23430/ ... .contains("Do")) { label4.setImageBitmap(doualatag); }...

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

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java - How change property values at runtime in Spring

I need change properties in my application at runtime. For example I have a service which send a e-mail with ... value in someway at runtime? 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 - AppEngine datastore: "Object with id ... is managed by a different Object Manager"

I'm using the Google AppEngine, with Java. When I use some datastore features, I'm getting an error message: ... , one to many" relationship. 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 simulate the Out Of memory : Requested array size exceeds VM limit

I used the Out Of Memory help from sun's site. Where it is quoted as Out Of Memory : Requested array size ... (build 14.1-b02, mixed mode) 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 list of properties of a class as Jackson views it?

I'm writing code that needs to access the list of properties of a class as defined by a Jackson configuration. ... construtor etc.). Any ideas? 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 - Creating Database in JDBC Sqlite

I am using the SQLite driver from http://code.google.com/p/sqlite-jdbc/wiki/Introduction Examples shown in the ... is giving a clear answer. 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 LinearLayout instance.getLayoutParams look to have a wrong class?

If I declare LinearLayout linearLayout and look at linearLayout.getLayoutParams(), it gives me ViewGroup.LayoutParams, ... or something else? 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 - Correct implementation of initialization-on-demand holder idiom

I have got two versions of "Initialization-on-demand holder idiom": http://en.wikipedia.org/wiki/Initialization- ... situations for using them. 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 it really worth implementing toString() for entity classes

It is consistently advised to override (implement) the toString() method of a class. The Java API documentation ... thrown by Person.marry()? 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 JTextArea to display fixed-width font without antialiasing

Does anybody know how to get JTextArea to display a fixed size font on all platforms? I want to make a simple ... swing? Thanks ahead of time! 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 does a stream close if its not closed manually?

I would like to know when does a stream close if its not closed manually. By this I mean, will the stream ... that? Any help is 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 - Inner classes with the same name as an outer class?

Constraints: I have a maven source code generator that I wrote that is creating POJO classes from some data files ... to get this to compile? 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 - Deleting files via a 'ContentResolver' as opposed to deleting them via 'file.delete()'

I have just written a function in an android app that deletes a file using the standard 'File' class in Java. i.e: String ... "+path+ " ^_^"); } 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 create a JTextArea with a specified width and the smallest possible height required to display all the text?

In all the examples that I can find that use a JTextArea, the height & width is known before constructing the ... Thank you all for your 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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java - How do I wait for a SwingWorker's doInBackground() method?

Say I have the following code: import java.lang.InterruptedException; import javax.swing.SwingWorker; public class Test ... make a new thread? 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 “Use '--release' option” in IntelliJ 2018.1 preferences?

In the preferences for IntelliJ 2018.1 (Build, Execution, Deployment > Compiler > Java Compiler) is an checkbox ... /function of this option? 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 - Does log.debug decrease performance

I want to write some logs at the debug log which will not be available in the production logs which has ... sure whether these are 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 - GUI: How can I find out if certain Unicode characters are supported?

I noticed that Metal L&F doesn't support certain arrow characters from Unicode, while Nimbus and GTK L&Fs ... which Unicode characters?" 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 - Tomcat 7: Connection reset by peer or Software caused connection abort

I have a problem when I'm trying to deploy Java-application. Cannot invoke Tomcat manager: Connection reset by ... understand what is wrong:C 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 - EXIF data in JPEG file

Write custom data as a Exif data in a JPEG image file using ExifInterface in Android Would like to write/ ... short of information with image 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 - Parsing xml with DOM, DOCTYPE gets erased

how come dom with java erases doctype when editing xml ? got this xml file : <?xml version="1.0" encoding=" ... of these worked... thank you ! 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 - Gson: JsonSyntaxException on date

I am trying to use Gson to deserialize a json array, but am currently getting a JsonSyntaxException. The json string ... know what is going on? 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 - JSTL c:forEach, decremental number loop impossible?

I want to print decremental numbers like: <c:forEach var="i" begin="10" end="0" step="-1"> ... $ ... forEach reverse order What's wrong with 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 - CXF - ClassCastException (SEIStub/ClientProxy)

I'm trying to build a client jar file to access a webservice. I'm including the jar in a servlet/war that ... point me in the right direction? 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 link project in eclipse

I have a java project and I want to develop it without replacing the source code from its place. I ... my workspace without replace physically? 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 - Operation Time Out Error in cqlsh console of cassandra

I have a three nodes Cassandra Cluster and I have created one table which has more than 2,000,000 rows. When I ... limit 50,000 it works fine. See Question&Answers more detail:os...

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

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