Recent questions tagged Java

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java - Postgresql, JDBC, and streaming BLOBs

I am trying to retrieve a blob from a postgres database using the jdbc drivers. It is too big to have ... streaming large blobs as a download. 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 - File based h2 persisted but not loaded in Spring Boot

I made a small application based on Spring Boot: spring-boot-starter-web spring-boot-starter-data-jpa The application ... message = message; } } 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 print two dimensional array of strings as String

I know how to do the toString method for one dimensional arrays of strings, but how do I print a two dimensional ... can I print a 2D array? 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 - @Basic(fetch = FetchType.LAZY) does not work?

I use JPA (Hibernate) with Spring. When i want to lazy load a Stirng property i use this syntax: @Lob @Basic( ... work. Please help me. Khosro. 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 - Dataflow anomaly analysis warnings from PMD

I am using Eclipse with the PMD Plug-in (4.0.0.v20130510-1000) and get a lot of those violations: Found 'DD'- ... i.e. why is it bad practice)? 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 the mode=mysql to embedded H2 DB in Spring Boot 1.4.1 for @DataJpaTest?

I have some problems with using a schema.sql file to create my sql schema when executing a junit test while this ... simple way to add a 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 - Why is my EmbeddedId in hibernate not working?

I have a compound Primary Key (IDHOLIDAYPACKAGE, IDHOLIDAYPACKAGEVARIANT) in table HolidayPackageVariant where IDHOLIDAYPACKAGE ... code } 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 - Apache Jackrabbit JCA 2.7.5 .docx and .xlsx indexing

I'm ussing the Appache Jackrabbit JCA 2.7.5, the problem is that files .docx and .xlsx is not ... ocm.getQueryManager(); Filter filter; filter = queryManager.createFilter(e...

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

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java - Debugging and counting breakpoint hits

Sometimes when I examine a code I didn't write, I launch eclipse in debug mode and use figures to understand ... your opinions about it. 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 - Getting FileSystemException "A required privilege is not held by the client" using Files.createSymbolicLink in Play Framework

I'm trying to use the new Java 7 Files.createSymbolicLink() method within Play! Framework, and I got the ... future readers) will be grateful. 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 - understanding URLConnection.setReadTimeout()

Consider the following snippet: URLConnection connection = target.openConnection(); connection.setConnectTimeout(5000); // 5 ... Is it correct? 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 - Convert InputStream into JSON

I am using json-rpc-1.0.jar.Below is my code. I need to convert InputStream object into JSON ... ExampleFilter.doFilter(ExampleFilter.java:149) 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 - Interrupt a thread in DatagramSocket.receive

I'm building an application that listens on both TCP and UDP, and I've run into some trouble with my ... that the behavior is not consistent. 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 - Any way to hide comments in Eclipse

Does anyone know if it would be possible to hide java comments in Eclipse? Is there any trick I could try? 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 capitalize every letter in an Android EditText?

I have an array of editTexts which I make like this: inputs[i] = new EditText(this); inputs[i].setWidth(376); ... behave the way I want them to? 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 - Passing ArrayList<Subclass> to method declared with List<Superclass>

I have a method with a parameter containing generics. public static void readList(List<ModelObject> list) { // ... declaration to allow 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 - Type mismatch in key from map: expected org.apache.hadoop.io.Text, recieved org.apache.hadoop.io.LongWritable

I am trying to run a map/reducer in java. Below are my files WordCount.java package counter; public class ... default Mapper and reducer class. 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 - Use of Serializable other than Writing& Reading object to/from File

In Which Cases it is a good coding practice to use implements serializable other than Writing & Reading object to ... objects to/from 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 - Maven POM-Editor: Dependency Graph missing

In Eclipse Helios I have the nice feature of a dependency graph inside the maven pom editor. But in later ... m using OSX, 64bit cocoa) 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 we need to serializable object for passing one activity to another activity in Android

Can anybody please tell why we need to serializable object for passing one activity to another activity in ... without serializable. 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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446 views

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java - Request Parameter Losing Plus Sign

I am editing a search form and trying to protect against special characters in the database. In the JSP ... before sending the request. See Question&Answers more detail:os...

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

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390 views

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java - Why HttpRequest.HttpMethod is string instead of Enum?

In the Reference of HttpRequest.HttpMethod of .NET Framework, request type is declared with System.String type. In RFC ... Do you have an idea? 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 - Name the Thread of an AsyncTask

Is it possible to give a name to an AsyncTask's background thread, as for normal Threads in Java: Thread(Runnable ... method in a helper class. 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 return a value from try, catch, and finally?

So when I do a code of blocks inside a try{}, and I try to return a value, it tells me no return values ... when you are using try and catch? 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 should I use the dollar symbol ($) in a variable name?

The dollar symbol ($) is a valid character to name a variable, e.g. String superSecretFormula$;, but when we're ... blank spaces can't be used. See Question&Answers more detail:os...

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

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286 views

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java - Converting a TreeSet to ArrayList?

I have a TreeSet which contains > 100k objects. I have another method which requires ArrayList as an param. ... object manually to ArrayList ? See Question&Answers more detail:os...

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

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271 views

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java - How to format numbers to a hex strings?

I want to format int numbers as hex strings. System.out.println(Integer.toHexString(1)); prints 1 but I want it as 0x00000001. How do I do that? 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 lifecycle observer and how to use it correctly?

I have read about new architectural components in Android. So, i wanted to ask what are lifecycle observers and ... ? Thanks for your 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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