5.1.4 Preparation: Environment (client)

Overview

This chapter shows the procedure to build an environment where you can build and execute GridDB Java applications. These instructions are specifically use Windows 10 (64 bit) as a development environment and CentOS 7.2 (64 bit) as an execution environment but can be adapted for other operating systems as well.

Obtaining the files

First download the following the files to your build environment, the tested versions and filenames are listed in Table 1.

Table 1 file available to

Software	Version	File name	Site to get
Java(Java SE Development Kit) (Windows)	8u102	jdk-8u101-windows-x64.exe	Java SE Development Kit 8
Java(Java SE Development Kit) (Linux)	8u102	jdk-8u101-linux-x64.rpm	Java SE Development Kit 8
Eclipse(Eclipse IDE for Java Developers)	Neon	eclipse-java-neon-R-win32-x86_64.zip	Eclipse IDE for Java Developers

Construction of Build Environment

Java Installation

Table 1 there run the Java installer (jdk-8u102-windows-x64.exe), and install it. If you do not want to change the setting, it will be installed in C:\ Program Files \ Java \ jdk1.8.0_102.

Setting of environment variable

First set Java's path in the Windows environment variable registry.
Control Panel > system and security > system > Advanced System Settings and click , Open the properties of the system.

Figure 1 system Advanced

Click on the Advanced tab of environment variable (N) ... button.

Figure 2 environment variable

Add the following to the environment variable to the system environment variables:

• Variable name: JAVA_HOME
• Variable value: C:\Program Files\Java\jdk1.8.0_102

Figure 3 Java environment variable

In addition, the system path must be changed by first selecting 'Path' in the list, clicking the 'Edit' button, and then then inserting "%JAVA_HOME%;" to the beginning of the text field.

Figure 4 Edit Path

After you change the above environment variables click the 'OK' button.

Install Eclipse

Follow Eclipse's instructions on how to run the Eclipse. No specific options are required for GridDB development.

Import of source code

After Eclipse is installed you can start it and create a workspace in any location.

Download the source code for the first GridDB sample presented in GridDB Basics here: griddb_first.zip.

Figure 5 Creatde a Workspace

In the Eclipse Package Exploer click the 'Import' function:

6 project import of

Select General > Existing Projects and click the Next button.

7 import method selection

Select the Zip file that you downloaded and click the Finish button.

8 import method selection

Build of jar file

Use the Ant build.xml that will compile and generates a jar file.

In the Package Explorer build > to select build.xml to display the context menu, Click on the 1 Ant Build Run As >.

9 build run

If the build is successful, jar file in the folder out is output. When you click the Refresh in the context menu of the Package Explorer, It shows.

Figure 10 build success

Construction of execution environment

Then, in gshost that you created in the Environment (server)] (../ sample_app_prepare_server) Install the Java in order to run the sample application.

Installation of Java

Place Table 1 of Java of rpm files (jdk-8u101-linux-x64.rpm) to any location on the gshost, Please install the following procedure.

$ cd /tmp
$ sudo rpm -Uvh /tmp/jdk-8u101-linux-x64.rpm
$ sudo alternatives --config java

There are 2 programs which provide 'java'.

  Selection Command
-----------------------------------------------
* + 1 /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.111-2.6.7.2.el7_2.x86_64/jre/bin/java
   2 /usr/java/jdk1.8.0_102/jre/bin/java

Press Enter to keep the current selection [+], or type the selection number you wish too use. In this case, we want to use  2 . Now java returns corresponds with the correct version.

$ java -version
java version "1.8.0_102"
Java (TM) SE Runtime Environment (build 1.8.0_102-b14)
Java HotSpot (TM) 64-Bit Server VM (build 25.102-b14, mixed mode)

Placement of the jar file

Create a sample directory and copy the files from the built Eclipse project as follows:

sample /
├─lib ... Directly copy the lib directory of the Eclipse project.
│ gridstore-conf.jar
│ gridstore.jar
│ opencsv-3.8.jar
├─data ... Directly copy the data directory in the Eclipse project.
│ liveimage1.jpg
│ liveimage2.jpg
│ instrument_log.csv
│ weather_station.csv
└─ < jar file > ... Copy the jar file from the output directory of the Eclipse project.

You can run the sample application as follows:

$ java -jar < jar file >