JDK1.7 | 易学教程

Not able to build using maven 3.6 and jdk 1.7

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问题 I have created a project using maven, but when I am building the project I am getting error. I am using jdk 1.7u21 If I use jdk 1.8 it the build is working fine, its only I use jdk 1.7 then the issue is coming. Tried using the TSL 1.2 in my build goal I have used -Dhttps.protocols=TLSv1.2 clean install Also I have tried adding the below : wagon-ftp and plexus-utils as under build but still not working my pom file is as mentioned below: <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns

What is the difference between ojdbc6.jar and ojdbc7.jar?

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问题 Will ojdbc6.jar work for JDK 1.7 and Oracle 12c? Should I use ojdbc7.jar? Thank you in advance. 回答1: The included ojdbc6.jar is the latest 12c driver. The only difference between ojdbc6.jar and ojdbc7.jar is that the latter one is compiled with Java 7. Since DB Solo is at least for now using Java 6, it can only include ojdbc6.jar. In terms of functionality the versions are identical. Link 回答2: Note that another difference between ojdbc6 and ojdbc7 is the supported Oracle version. Specifically

How to add iText into my netBeans project?

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问题 Im using Netbeans 8.0.2 and I am trying to give my output as a PDF file. On a quick google search, I learnt iText can help me do it. But how can i import iText package into my project? How should i import the package that i have downloaded (latest). 回答1: If your project uses Maven then you simply add iText to your pom.xml . <dependency> <groupId>com.itextpdf</groupId> <artifactId>itextpdf</artifactId> <version>5.5.8</version> </dependency> See http://developers.itextpdf.com/itext-java 回答2:

How to know if I am using Open JDK or Oracle JDK?

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问题 Using java -version gives me this. java version "1.7.0_80" Java(TM) SE Runtime Environment (build 1.7.0_80-b15) Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode) Is it an OpenJDK or OracleJDK ? 回答1: I think that you're using OracleJDK. As I saw with a google search, the openJDK --version output is like this: java -version openjdk version "1.8.0-internal" OpenJDK Runtime Environment (build 1.8.0-internal-0) OpenJDK 64-Bit Zero VM (build 25.0-b20-internal, interpreted mode) See:

I still see Java 1.8 when I am doing java -version after downgrading to 1.7

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问题 I downgraded java 1.7 from 1.8, but I still see 1.8 when I do java -version . I changed the path and also made JAVA_HOME changed for 1.7 as JAVA_HOME: C:\Program Files (x86)\Java\jdk1.7.0_79 PATH: C:\Program Files(x86)\Java\jdk1.7.0_79\bin For some reason I also have this in my path: C:\ProgramData\Oracle\Java\javapath , which I believe keeps this 1.8 version. When I take off this from the path, I get this message: C:\Program Files\Java\jre7\lib\amd64\jvm.cfg . I don't know what's going on.

Why is File.exists() behaving flakily in multithreaded environment?

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问题 I have a batch process running under java JDK 1.7. It is running on a system with RHEL, 2.6.18-308.el5 #1 SMP. This process gets a list of metadata objects from a database. From this metadata it extracts a path to a file. This file may or may not actually exist. The process uses the ExecutorService ( Executors.newFixedThreadPool() ) to launch multiple threads. Each thread runs a Callable that launches a process that reads that file and writes another file if that input file exists (and logs

I still see Java 1.8 when I am doing java -version after downgrading to 1.7

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I downgraded java 1.7 from 1.8, but I still see 1.8 when I do java -version . I changed the path and also made JAVA_HOME changed for 1.7 as JAVA_HOME: C:\Program Files (x86)\Java\jdk1.7.0_79 PATH: C:\Program Files(x86)\Java\jdk1.7.0_79\bin For some reason I also have this in my path: C:\ProgramData\Oracle\Java\javapath , which I believe keeps this 1.8 version. When I take off this from the path, I get this message: C:\Program Files\Java\jre7\lib\amd64\jvm.cfg . I don't know what's going on. Any suggestion would be very helpful. TRY DOING THE FOLLOWING: Type "regedit" from startup menu. Take a

Unable to Run Kotlin Application in Eclipse

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In order to create my first, simple Kotlin project in Eclipse, I followed the steps in Getting Started with Eclipse Luna tutorial from Kotlin official website, i.e.: Install Kotlin Plugin for Eclipse from Eclipse Marketplace Open the Kotlin perspective and created a Kotlin Project Created the file "hello.kt" inside the "src" folder with the main method Right-clicked the file > Run As > Kotlin Application However, I keep get the following error in Eclipse console: Error: Could not find or load main class HelloKt I have double-checked the Run Configuration for my project, and it does set the

Why is File.exists() behaving flakily in multithreaded environment?

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I have a batch process running under java JDK 1.7. It is running on a system with RHEL, 2.6.18-308.el5 #1 SMP. This process gets a list of metadata objects from a database. From this metadata it extracts a path to a file. This file may or may not actually exist. The process uses the ExecutorService ( Executors.newFixedThreadPool() ) to launch multiple threads. Each thread runs a Callable that launches a process that reads that file and writes another file if that input file exists (and logs the result) and does nothing if the file does not exist (except log that result). I find the behavior is

How to know if I am using Open JDK or Oracle JDK?

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Using java -version gives me this. java version "1.7.0_80" Java(TM) SE Runtime Environment (build 1.7.0_80-b15) Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode) Is it an OpenJDK or OracleJDK ? I think that you're using OracleJDK. As I saw with a google search, the openJDK --version output is like this: java -version openjdk version "1.8.0-internal" OpenJDK Runtime Environment (build 1.8.0-internal-0) OpenJDK 64-Bit Zero VM (build 25.0-b20-internal, interpreted mode) See: http://mail.openjdk.java.net/pipermail/jdk8-dev/2013-July/002840.html On debian, jessie-backports, openjdk-8: