Recent questions tagged JAVA

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java - How to constantly detect nearby marker locations from current location in Google Maps android?

I am trying to display a TextView at the top left corner of Google Maps that inform users if they are x ... me in the right direction? 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 - Prevent automatic String to Integer conversion in Jackson

I have a simple POJO: public class ADate { private Integer day; private Integer month; private Integer year; . ... values are defined as String. 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: constructor injection of primitive values (properties) with annotation based configuration

I'm trying to configure a class with Annotation based configuration in Spring 3, which takes primitive values as its ... t seem to work either. 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 - PSQLException: ResultSet not positioned properly, perhaps you need to call next

public UserBean authenticate(String username,String password){ PostGresDAO pg=new PostGresDAO(); //creates new ... next. Please advice. 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 not found exception in jar

public class ABC { public ABC() { File file = new File("xyz.xml"); but when I run my jar as follows: java - ... ABC.java:47) How can I fix 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 - spring junit testing

I have a maven spring project (latest version) and I want to write some junit tests (latest version). The ... so that things are autowired? 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 use JPA2 on JBoss 5.x ? (or How to eliminate class loading isolation issue?)

I would like JBoss to use only the dependencies located in my war file. Each time I deploy this war file, JBoss still ... "/> JBoss 5.1.0.GA 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 - Execute native sql with hibernate

I'm using hibernate 4.2.6 and PostgreSQL 9.1 I've been trying to execute sql query with hibernate. I've ... , but native query wth JDBC works? 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 Play Framework support "snippets"?

If i want to have a common piece of UI across multiple pages, such as a menu, what is the recommended way ... this would be achieved in general. 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 - final fields and thread-safety

Should it be all fields, including super-fields, of a purposely immutable java class 'final' in order to be ... extension class be thread-safe? 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 or JSP 2.0 EL for getter with argument

How can I access a getter that has a parameter using JSTL or JSP 2.0 EL? I want to access something ... tried everything but is 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 - Class [org.apache.derby.jdbc.ClientDriver] not found. When trying to connect to db

I have set up a project in Netbeans, created a script, made a new database with javadb. I can connect to ... </persistence-unit> </persistence> 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 - Dynamic class annotation

I want to annotate a class dynamically to make it the more generic as possible: public class Test<T> { ... achieve something like this. TA See Question&Answers more detail:os...

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

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320 views

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java - iText - avoid last row not to cut tables on page split to next page

I am working on itext 5 using java. I have pages with mutiple tables with dynamic rows. In some instances, the ... ; table.addCell(cell); } } 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 - Thread Safety of ServletContext objects

I am storing a HashMap object in my ServletContext. But Multiple Request thread are reading and Modifying this HashMap. ... to achive the same ? 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 - Do I have to set both sides for a bidirectional relationship?

@Entity public class A { @GeneratedValue @Id private long id; public long getId() { return id; } public void setId ... .remove(b) See also 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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283 views

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java - JButtons inside JPanels with a GridLayout JFrame

I have one JFrame that is set to a GridLayout of size NxN. N is given by the user as a command line ... nice with the GridLayout layout JFrame. See Question&Answers more detail:os...

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

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290 views

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java - Wicket: how to render page programmatically and get result as string?

I'm in the process of converting an app to use i18n/l10n on all its pages. I'm very happy with Wicket's ... seem like a good solution to 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 is List<Number> not a sub-type of List<Object>?

public void wahey(List<Object> list) {} wahey(new LinkedList<Number>()); The call to the method will not ... get some comments on this decision? 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 reporting and site generation for multiple module project

I am trying to get project with submodules to test and generate reports correctly, but have got some problems. ... ? Thanks for any suggestions. See Question&Answers more detail:os...

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

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260 views

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java - Why getClass returns the name of the class + $1 (or $*)

I'm writing a piece of code in which I have to cast an Object if it is an instance of a certain class. ... Is there a solution or a 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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288 views

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java - work sun.misc.BASE64Encoder/Decoder for getting byte[]

I am trying to use sun.misc.BASE64Encoder/Decoder, but this code: (new sun.misc BASE64Encoder()).encode(new ... string/XML/" I am embarrassed 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 Tomcat and static resources and mvc:resources

I started doing a web app from scratch. Before I've always been working on apps that were already running for a ... " location="/resources/" /> See Question&Answers more detail:os...

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

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339 views

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java - To break a message in two or more lines in JOptionPane

try { Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); String connectionUrl = "jdbc:sqlserver://"+hostName ... two or more parts. 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 - Reading line breaks in CSV which are quoted in the file in FlatfileItemReader of spring batch

I am trying to parse a CSV file with FlatFileItemReader. This CSV contains some quoted newline characters as shown ... </bean> </property> See Question&Answers more detail:os...

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

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116 views

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java - firestore database add image to record

I need to add jpeg images to firestore db records. My preferred way would be in a Blob as I have used in ... blob ); I appreciate any 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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478 views

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java - Hibernate EntityManager, is it supposed to be used as a singleton?

I am not using Spring so I am creating an instance of EntityManager within a class. I used Hibernate- ... /persistence-unit> </persistence> See Question&Answers more detail:os...

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

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280 views

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java - How can I remove a JPanel from a JFrame?

Recently I asked here how to add a new JPanel to JFrame. The answer helped me to get a working code. But not I have ... .validate(); } }); } }; See Question&Answers more detail:os...

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

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