java-7

问题 We are using WL 11g and jdk1.7 update 121 on linux machine. We are seeing below error during web service call to another weblogic machine. Any thoughts 2017-02-14 18:23:20,777 [system] [DEBUG] [rule] UserProvisioningServiceUtility.log - tcContactPK:: 0 2017-02-14 18:23:20,777 [system] [DEBUG] [rule] UserProvisioningServiceUtility.log - replacing created by with actual pk 2017-02-14 18:23:20,778 [system] [DEBUG] [rule] UserProvisioningServiceUtility.log - hostname : uatapp.corp.com 2017-02-14

问题 I have a sample java code below which if run as a console application behaves as I expected ( spawning a single thread to execute the runnable). The strange behavior (spawning two threads - sample below) I see is when I run this sample as a service application using Apache's prunsrv64.exe. I am testing this on a Windows 7 machine - 64bit. Sample Output: Thread -28 Current time: 09:50:11 AM Thread -52 Current time: 09:50:12 AM Thread -28 Current time: 09:50:21 AM Thread -52 Current time: 09:50

问题 If I do something like try ( Connection conn = Database.getConnection(); PreparedStatement ps = conn.prepareStatement("SELECT * FROM table WHERE something = ? LIMIT 1"); ) { ps.setString(1, "hello world"); ResultSet results = ps.executeQuery(); if(results.next()) { // blah } } catch(SQLException e) { e.printStackTrace(); } Will the ResultSet still be closed when the PreparedStatement is closed, or will I still have to explicitly close the ResultSet also? 回答1: As per javax.sql.Statement.close(

问题 If I do something like try ( Connection conn = Database.getConnection(); PreparedStatement ps = conn.prepareStatement("SELECT * FROM table WHERE something = ? LIMIT 1"); ) { ps.setString(1, "hello world"); ResultSet results = ps.executeQuery(); if(results.next()) { // blah } } catch(SQLException e) { e.printStackTrace(); } Will the ResultSet still be closed when the PreparedStatement is closed, or will I still have to explicitly close the ResultSet also? 回答1: As per javax.sql.Statement.close(

问题 I have the Java 8 SDK and runtime, and a project that is only using Java 7 features. I was wondering whether I could set up intellij to build a Java-7-level jar, something that is definitely possible from command line? So far, I have tried simply setting the project language level to 7 as an experiment, but that is obviously insufficient and not really what I need. I have also seen this question on SO: "Intellij IDEA using java7 compiler to compile when I have configured it to use Java6", but

问题 This question already has answers here : Incompatible types List of List and ArrayList of ArrayList (6 answers) Initialize List<List<Integer>> in Java (2 answers) Closed 2 years ago . I want to understand the difference between the two definitions and why the correct one is correct and the wrong is wrong. The one showing me the compile-error List<List<Integer>> arr2 = new ArrayList<ArrayList<Integer>>(); The error it gave me : try2.java:8: error: incompatible types: ArrayList<ArrayList

问题 The following code class GenericCompilationFailureDemo { List<? extends GenericCompilationFailureDemo> newList() { return new ArrayList<GenericCompilationFailureDemo>(); }; void useList() { List<GenericCompilationFailureDemo> list = (List<GenericCompilationFailureDemo>) newList(); } List<? extends Set<GenericCompilationFailureDemo>> newListOfSpecificSets() { return new ArrayList<Set<GenericCompilationFailureDemo>>(); }; void useListOfSpecificSets() { List<Set<GenericCompilationFailureDemo>>

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . Does anyone know of any tool to convert Java 8 code (at the source level) that uses lambdas and method references into Java 7 code that uses anonymous inner classes? I know about Retrolambda, but that works at the bytecode level, not the source level. For now, I have a version working that works as an IntelliJ

问题 This question already has answers here : How to construct a relative path in Java from two absolute paths (or URLs)? (22 answers) Closed 3 years ago . I need to get the relative file path (relative to the program executable path) from a File object. What's the best way to do this? File offers only methods for the absolute path. Maybe getting execution path manually and then cut this path off from the absolute path to get a relative path? I am on Java 7, just in case java.nio has some helping

问题 This question already has answers here : How to construct a relative path in Java from two absolute paths (or URLs)? (22 answers) Closed 3 years ago . I need to get the relative file path (relative to the program executable path) from a File object. What's the best way to do this? File offers only methods for the absolute path. Maybe getting execution path manually and then cut this path off from the absolute path to get a relative path? I am on Java 7, just in case java.nio has some helping