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Java sockets – system monitoring / server – parallel stats capturing

January 26, 2017March 3, 2017 Eli Kleinman Leave a comment

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While capturing local system stats I needed a way to run parallel captures The code below is still a work in progress how to can/will be done, more on that is explained below. For example: I am trying to capture CPU, Mem every second, but at the same I am also capturing my db response […]

Java sockets – system monitoring / server publisher process

January 26, 2017March 6, 2017 Eli Kleinman Leave a comment

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This is part two – on how to capture and publish Solaris client performance stats. To read part one please click here. This program will retrieve the last system stats from the local SQLite DB and make it available over a socket or http connection for remote fetching. Once the program is running, just telnet […]

Java sockets – system monitoring / server capture process

January 26, 2017March 6, 2017 Eli Kleinman Leave a comment

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Monitoring remote Solaris client’s by using Java sockets. The below configuration shows how to configure a host (Solaris or Linux), to expose local performance states in JSON using Java sockets, the stats are then collected by a remote system to crunch (graph/chart) the data. The full capture pipeline process is outline below. Note: If losing […]

Java – How to create a jar file from multiple packages

January 26, 2017March 3, 2017 Eli Kleinman Leave a comment

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How to create a runnable jar file from multiple java packages. The below example has two packages mypkg1 & mypkg2 with the below directory structure As you can see below I have 3 java files and two packages

# pwd 
/tmp/prog

# du -a
4       ./mypkg1/One.java
4       ./mypkg1/Two.java
16      ./mypkg1
4       ./mypkg2/Res.java
8       ./mypkg2

# pwd

/tmp/prog

# du -a

4 ./mypkg1/One.java

4 ./mypkg1/Two.java

16 ./mypkg1

4 ./mypkg2/Res.java

8 ./mypkg2

Example java main method file.

package mypkg1;

import mypkg2.Res;

public class One
{
        public static void main(String[] args) {
                Two two = new Two();
                Res res = new Res();
                System.out.println(two.Two(2, 2));
                System.out.println(res.Res(4, 2));
        }
}

package mypkg1;

import mypkg2.Res;

public class One

{

public static void main(String[] args) {

Two two = new Two();

Res res = new Res();

System.out.println(two.Two(2, 2));

System.out.println(res.Res(4, 2));

}

Create a Manifest file Note: mypkg1 contains the main and […]

Java solution for – Error: Could not find or load main class

January 26, 2017May 26, 2017 Eli Kleinman Leave a comment

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For example java package mypkg1 contains the main but I am still getting the error Error: Could not find or load main class One Full example below. mypkg1/One.java

package mypkg1;

import mypkg2.Res;

public class One
{
        public static void main(String[] args) {
                Two two = new Two();
                Res res = new Res();
                System.out.println(two.Two(2, 2));
                System.out.println(res.Res(4, 2));
        }
}

package mypkg1;

import mypkg2.Res;

public class One

{

public static void main(String[] args) {

Two two = new Two();

Res res = new Res();

System.out.println(two.Two(2, 2));

System.out.println(res.Res(4, 2));

}

Two.java

package mypkg1;

public class Two 
{
    public int Two (int a, int b)
    {
        int c;
        c = a + b;
        return c;
    }
}

package mypkg1;

public class Two

{

public int Two (int a, int b)

{

int c;

c = a + b;

return c;

}

After compiling with javac. pwd /tmp/my_program Now lets run the program, all works

java mypkg1.One
4
6

java mypkg1.One

But if the same is run from /

java /tmp/prog/mypkg1.One
Error: Could not find or load main class .tmp.my_program.mypkg1.One

1 2	java /tmp/prog/mypkg1.One Error: Could not find or load main class .tmp.my_program.mypkg1.One

The […]

JME3 and Blender howto

January 26, 2017March 3, 2017 Eli Kleinman Leave a comment

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JME beginners howto Full walkthrue

https://www.youtube.com/watch?v=xdHRcVuLOw0&index=2&list=PLTHo3uR01soQ2ZNf5AB7k6CPLyVKt7PT7

1	https://www.youtube.com/watch?v=xdHRcVuLOw0&index=2&list=PLTHo3uR01soQ2ZNf5AB7k6CPLyVKt7PT7

http://www.gamefromscratch.com/post/2015/08/31/A-Closer-Look-at-jMonkeyEngine.aspx

1	http://www.gamefromscratch.com/post/2015/08/31/A-Closer-Look-at-jMonkeyEngine.aspx

JME3 howto

https://docs.jmonkeyengine.org/beginner/hello_simpleapplication.html

1	https://docs.jmonkeyengine.org/beginner/hello_simpleapplication.html

Terrain map howto

https://jmonkeyengine.github.io/wiki/jme3/beginner/hello_terrain.html

1	https://jmonkeyengine.github.io/wiki/jme3/beginner/hello_terrain.html

Blender howto Blender Beginner Tutorial – Part 2: Moving, Rotating Blendor compile for Solaris (was not able to get it working)

https://wiki.blender.org/index.php/Dev:2.4/Doc/Building_Blender/Solaris

1	https://wiki.blender.org/index.php/Dev:2.4/Doc/Building_Blender/Solaris

Free blender 3d models

https://www.blender-models.com/model-downloads/buildings/

1	https://www.blender-models.com/model-downloads/buildings/

OpenRTS Engine

https://github.com/methusalah/OpenRTS

1	https://github.com/methusalah/OpenRTS

jme3 help series

# JME31 Sneak Peek Install 
https://www.youtube.com/watch?v=y41jUpt1ZJk

# 140621 GitHub First Timer 
https://www.youtube.com/watch?v=e3Ch2ep4YA8

https://www.youtube.com/channel/UCPeCbisQIUNg8I3KXi8WEMw/videos

# JME31 Sneak Peek Install

https://www.youtube.com/watch?v=y41jUpt1ZJk

# 140621 GitHub First Timer

https://www.youtube.com/watch?v=e3Ch2ep4YA8

https://www.youtube.com/channel/UCPeCbisQIUNg8I3KXi8WEMw/videos

OpenGL ThinMatrix First OpenGL development # full […]

Solaris OpenGL (lwjgl-2.x) library and install

January 26, 2017March 3, 2017 Eli Kleinman Leave a comment

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Note this works with version 2.x, version 3.x does not included the Solaris lib’s First Download the lwjgl library from sourceforge link below

http://sourceforge.net/project/showfiles.php?group_id=58488&package_id=54362&release_id=670417

1	http://sourceforge.net/project/showfiles.php?group_id=58488&package_id=54362&release_id=670417

To test the OpenGL run the below.

java -cp jar/lwjgl.jar:jar/lwjgl_test.jar:jar/lwjgl_util.jar -Djava.library.path=native/solaris org.lwjgl.test.WindowCreationTest

1	java -cp jar/lwjgl.jar:jar/lwjgl_test.jar:jar/lwjgl_util.jar -Djava.library.path=native/solaris org.lwjgl.test.WindowCreationTest

Now lets test JME3 Download from git the jme (try with stable version)

git clone https://github.com/jMonkeyEngine/jmonkeyengine.git

1	git clone https://github.com/jMonkeyEngine/jmonkeyengine.git

Now lets compile

./gradlew assemble

# Wait to complete successful
./gradlew createZipDistribution
... [snip]
:libDist
:createZipDistribution

BUILD SUCCESSFUL

./gradlew assemble

# Wait to complete successful

./gradlew createZipDistribution

... [snip]

:libDist

:createZipDistribution

BUILD SUCCESSFUL

lwjgl install JME setup Offical […]

How to use libGDX with Android Studio (gradle)

January 26, 2017March 3, 2017 Eli Kleinman Leave a comment

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First create a gradle.properties file Note: Change the ip and port below

systemProp.http.proxyHost=10.10.10.10
systemProp.https.proxyHost=10.10.10.10
systemProp.http.proxyPort=3120
systemProp.https.proxyPort=3120
systemProp.http.proxyUser=
systemProp.http.proxyPassword=
systemProp.https.proxyUser=
systemProp.https.proxyPassword=
systemProp.http.nonProxyHosts=
systemProp.http.proxyStrictSSL=false

systemProp.http.proxyHost=10.10.10.10

systemProp.https.proxyHost=10.10.10.10

systemProp.http.proxyPort=3120

systemProp.https.proxyPort=3120

systemProp.http.proxyUser=

systemProp.http.proxyPassword=

systemProp.https.proxyUser=

systemProp.https.proxyPassword=

systemProp.http.nonProxyHosts=

systemProp.http.proxyStrictSSL=false

Point the environment the gradle file

# Add gradle proxy settings
export GRADLE_USER_HOME=/root/.gradle
<pre>
Now lets install libGDX in Android Studio
Download the latest setup libGDX app.
<pre>
java -jar gdx-setup.jar

# Add gradle proxy settings

export GRADLE_USER_HOME=/root/.gradle

<pre>

Now lets install libGDX in Android Studio

Download the latest setup libGDX app.

<pre>

java -jar gdx-setup.jar

Only change the SDK folder and pick a detestation folder. Once Download is completed Go in to Android studio and import the project

Java hashmap single key Multiple Values

January 26, 2017January 16, 2019 Eli Kleinman Leave a comment

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Default java library

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

Google java library

import java.util.Set;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.Multimap;

import java.util.Set;

import com.google.common.collect.ArrayListMultimap;

import com.google.common.collect.Multimap;

Apache java library

import java.util.Set;

import org.apache.commons.collections.MultiMap;
import org.apache.commons.collections.map.MultiValueMap;

import java.util.Set;

import org.apache.commons.collections.MultiMap;

import org.apache.commons.collections.map.MultiValueMap;

Full working example

package com.sqlitedb.examples.util.map;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 *
 * @author Eli Kleinman
 */
public class TestArr {

    public void TestArr() {
        // create map to store
        Map&lt;string, list&lt;string=""&gt;&gt; map = new HashMap&lt;&gt;();
        
        List valSetOne = new ArrayList&lt;&gt;();
        valSetOne.add("Apple");
        valSetOne.add("Aeroplane");
        
        List valSetTwo = new ArrayList&lt;&gt;();
        valSetTwo.add("Bat");
        valSetTwo.add("Banana");
        valSetTwo.add("Apple");
        
        List valSetThree = new ArrayList&lt;&gt;();
        valSetThree.add("Joe");
        valSetThree.add("Jany");        
                       
        map.put("A", valSetOne);
        map.put("B", valSetTwo);
        map.put("G", valSetThree);
        
        // iterate and display values
        System.out.println("Fetching Keys and corresponding [Multiple] Values n");
        //for (Map.Entry&lt;string, list&lt;string=""&gt;&gt; entry : map.entrySet()) {
        map.entrySet().forEach((entry) -&gt; {    
            String key = entry.getKey();
            List values = entry.getValue();
            //System.out.println("Key = " + key);            
            //System.out.println("All Values = " + values.size());
            //System.out.println("Value zero = " + values.get(1));
            //for (i values.size()) {
            for(int x = 0; x &lt; values.size(); x = x + 1) {
                System.out.println("Key: " + key + " " + "Cur Item: " + values.get(x));
            }
        });                
    }    
}
&lt;/string,&gt;&lt;/string,&gt;

package com.sqlitedb.examples.util.map;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

/**

* @author Eli Kleinman

public class TestArr {

public void TestArr() {

// create map to store

Map<string, list<string="">> map = new HashMap<>();

List valSetOne = new ArrayList<>();

valSetOne.add("Apple");

valSetOne.add("Aeroplane");

List valSetTwo = new ArrayList<>();

valSetTwo.add("Bat");

valSetTwo.add("Banana");

valSetTwo.add("Apple");

List valSetThree = new ArrayList<>();

valSetThree.add("Joe");

valSetThree.add("Jany");

map.put("A", valSetOne);

map.put("B", valSetTwo);

map.put("G", valSetThree);

// iterate and display values

System.out.println("Fetching Keys and corresponding [Multiple] Values n");

//for (Map.Entry<string, list<string="">> entry : map.entrySet()) {

map.entrySet().forEach((entry) -> {

String key = entry.getKey();

List values = entry.getValue();

//System.out.println("Key = " + key);

//System.out.println("All Values = " + values.size());

//System.out.println("Value zero = " + values.get(1));

//for (i values.size()) {

for(int x = 0; x < values.size(); x = x + 1) {

System.out.println("Key: " + key + " " + "Cur Item: " + values.get(x));

}

});

}

</string,></string,>

Refrence

Tuning Java Garbage Collection(GC)

December 1, 2014July 21, 2017 Eli Kleinman Leave a comment

(No Ratings Yet)

Tuning java and GC The link below describes in great detail how to troubleshot, tune Java Garbage Collector(GC). Garbage First Garbage Collector Tuning

Tag: java

Java sockets – system monitoring / server – parallel stats capturing

Java sockets – system monitoring / server publisher process

Java sockets – system monitoring / server capture process

Java – How to create a jar file from multiple packages

Java solution for – Error: Could not find or load main class

JME3 and Blender howto

Solaris OpenGL (lwjgl-2.x) library and install

How to use libGDX with Android Studio (gradle)

Java hashmap single key Multiple Values

Tuning Java Garbage Collection(GC)

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