poniedziałek, 28 kwietnia 2014

Scanner & Open File - Java

package com.marek.Files;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;

public class openFile
{
    public static void main(String[] args)
    {
        try
        {
            System.out.print("Please Enter file name: ");
            String fName;
           
            Scanner scanIn = new Scanner(System.in);
            fName = scanIn.nextLine();
            BufferedReader br = new BufferedReader(new FileReader(fName));
            String sCurrentLine;
            try
            {
            while ((sCurrentLine = br.readLine()) !=null)
            {
                System.out.println(sCurrentLine);
            }
            }
            finally
            {
                br.close();
                scanIn.close();
            }
        }
        catch (IOException e)
        {
            //e.printStackTrace();
            System.out.println("No such file..");
        }
    }
}
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how to check if file is empty - Java 

File f = new File(fileName);

try  
{
     if( f.length() == 0 )
     {
          f.createNewFile();
     }  
     else  
     {
            doSomething()
     }
} 
catch (IOException e)  
{
        System.out.println("IO Error: " + e.getMessage());
} 
    finally  
{
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enable/disable glass fish app

cd $GLASS_FISH_HOME
for example:

/u01/usr/local/glasshfish3/glassfish/bin

asadmin disable appname
asadmin enable appname

 [root@kaukaz bin]# ./asadmin enable SwdDiagnostic
Enter admin user name>  admin
Enter admin password for user "admin">
remote failure: Unknown plain text format.  A properly formatted response from a PlainTextActionReporter
always starts with one of these 2 strings: PlainTextActionReporterSUCCESS or PlainTextActionReporterFAILURE.  The response we received from the server was not understood: Signature-Version: 1.0
message: Exception while preparing the app
Exception [EclipseL
 ink-4002] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): or
 g.eclipse.persistence.exceptions.DatabaseException
Internal Exception
 : java.sql.SQLException: Error in allocating a connection. Cause: Con
 nection could not be allocated because: ORA-01017: niepoprawna nazwa
 uĹŸytkownika/hasĹo; odmowa zalogowania

 [root@kaukaz bin]# ./asadmin enable SwdDiagnostic
Enter admin user name>  admin
Enter admin password for user "admin"

Command enable executed successfully
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wtorek, 22 kwietnia 2014

oracle-xe ubuntu starting problem

problem:

root@lati:/usr/lib/oracle/xe/app/oracle/product/10.2.0/server/bin# ./oracle_env.sh
/usr/lib/oracle/xe/app/oracle/product/10.2.0/server/bin/nls_lang.sh: 108: /usr/lib/oracle/xe/app/oracle/product/10.2.0/server/bin/nls_lang.sh: [[: not found
/usr/lib/oracle/xe/app/oracle/product/10.2.0/server/bin/nls_lang.sh: 110: /usr/lib/oracle/xe/app/oracle/product/10.2.0/server/bin/nls_lang.sh: [[: not found
root@lati:/usr/lib/oracle/xe/app/oracle/product/10.2.0/server/bin# ./nls_lang.sh
./nls_lang.sh: 108: ./nls_lang.sh: [[: not found
./nls_lang.sh: 110: ./nls_lang.sh: [[: not found

solution:
in /usr/lib/oracle/xe/app/oracle/product/10.2.0/server/bin/nls_lang.sh
change:
#!/bin/sh
to
#!/bin/bash
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ubuntu oracle-xe path

/usr/lib/oracle/xe/app/oracle/product/10.2.0/server/bin
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sed - how to add something in front of line

1. marek@lati:/tmp$ cat test
marek
sed
awk
linux

2. make change only in output
marek@lati:/tmp$ sed 's/^/....../g' test
......marek
......sed
......awk
......linux

3. add few "." in the front of the line and save it to source file

marek@lati:/tmp$ sed -i 's/^/....../g' test
marek@lati:/tmp$ cat test
......marek
......sed
......awk
......linux
 

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poniedziałek, 14 kwietnia 2014

eclipse problem

problem:

root@lati:~/.eclipse/org.eclipse.platform_3.7.0_155965261/configuration# cat 1397493884904.log
!SESSION 2014-04-14 18:44:44.801 -----------------------------------------------
eclipse.buildId=I20110613-1736
java.version=1.7.0_51
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=pl_PL
Command-line arguments:  -os linux -ws gtk -arch x86_64

!ENTRY org.eclipse.osgi 4 0 2014-04-14 18:44:49.097
!MESSAGE Application error
!STACK 1
java.lang.UnsatisfiedLinkError: Could not load SWT library. Reasons:
    no swt-gtk-3740 in java.library.path
    no swt-gtk in java.library.path
    Can't load library: /home/marek/.swt/lib/linux/x86_64/libswt-gtk-3740.so
    Can't load library: /home/marek/.swt/lib/linux/x86_64/libswt-gtk.so

solution:

Ubuntu 12.04 32 bit. I edit the command to: 
ln -s /usr/lib/jni/libswt-* ~/.swt/lib/linux/x86/
 
And on Ubuntu 12.04 64 bit try: 
ln -s /usr/lib/jni/libswt-* ~/.swt/lib/linux/x86_64/
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niedziela, 13 kwietnia 2014

install jdk mint linux

1.  sudo apt-get update && apt-get remove openjdk*
2. download newest version from oracle.com
3. "unzip" jdk archive  tar -zxvf jdk-
4.  sudo mkdir -p /opt/java
5.  sudo mv jdk1.7.0_25 /opt/java
6.  sudo update-alternatives --install "/usr/bin/java" "java" "/opt/java/jdk1.7.0_25/bin/java" 1
sudo update-alternatives --set java /opt/java/jdk1.7.0_25/bin/java



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how to enable autologin in weblogic

goto:
for example

/home/marek/as/weblogic/wl/user_projects/domains/mbo/servers/AdminServer

make dir: security

cd sercurity

vi boot.properties

username=weblogic
password=password1234

after  first start inside of this file we find:

<2014-04-13 11:20:49 CEST> <Notice> <Security> <BEA-090083> <Storing boot identity in the file: /home/marek/as/weblogic/wl/user_projects/domains/mbo/servers/AdminServer/security/boot.properties.>


[marek@localhost security]$ cat boot.properties
#Sun Apr 13 11:20:49 CEST 2014
password={AES}Ka1REcyH2XCTR04sH1231231231231231231231pQ\=
username={AES}5YSNvhM7R+j5RFRuXuKHoTZawFEjxCip1h4yytjzI9k\


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sobota, 12 kwietnia 2014

add repository/source to eclipse

Scala source
1. Open Eclipse
2. Click Help / Install New Software
3. Click add and enter:
http://download.scala-ide.org/sdk/helium/e38/scala210/stable/site

Eclipse start whole process and after that process you need to restart the IDE
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files from rpm package

How Do I List Files For Installed Package?

You need to use rpm command as follows:




[marek@localhost Pobrane]$ rpm -ql sqldeveloper


alernative


rpm -qlp sqldeveloper-4.0.1.14.48-1.noarch.rpm




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Remi repo fedora 

## Fedora 20 ##
rpm -Uvh http://rpms.famillecollet.com/remi-release-20.rpm

## Fedora 19 ##
rpm -Uvh http://rpms.famillecollet.com/remi-release-19.rpm
 
## Fedora 18 ##
rpm -Uvh http://rpms.famillecollet.com/remi-release-18.rpm
 
## Fedora 17 ##
rpm -Uvh http://rpms.famillecollet.com/remi-release-17.rpm
 
yum must remember to enable remi repo in:
 
[marek@localhost ~]$ cat /etc/yum.repos.d/remi.repo 
[remi]
name=Les RPM de remi pour Fedora $releasever - $basearch
#baseurl=http://rpms.famillecollet.com/fedora/$releasever/remi/$basearch/
mirrorlist=http://rpms.famillecollet.com/fedora/$releasever/remi/mirror
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi
 
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piątek, 11 kwietnia 2014

discover active hosts in network

[marek@localhost Dokumenty]$ nmap -sP 192.168.0.0/24

Starting Nmap 6.40 ( http://nmap.org ) at 2014-04-11 22:30 CEST
Nmap scan report for 192.168.0.1
Host is up (0.0064s latency).
Nmap scan report for 192.168.0.10
Host is up (0.0095s latency).
Nmap scan report for 192.168.0.11
Host is up (0.000091s latency).
Nmap done: 256 IP addresses (3 hosts up) scanned in 2.94 seconds
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czwartek, 10 kwietnia 2014

Fedora 20 flash player instalation

1. 
su -c 'yum -y install http://linuxdownload.adobe.com/adobe-release/adobe-release-x86_64-1.0-1.noarch.rpm'
2. rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-adobe-linux
3. yum -y install flash-plugin   
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file name change script

#!/usr/bin/bash

for i in UI*.java
do
        new="G${i}"
        echo $i ' ==> ' $new
        mv $i $new
done
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poniedziałek, 7 kwietnia 2014

jsp connected to oracle-xe instance

<%@ page import="java.sql.*" %>

<HTML>
<HEAD>
<TITLE>Oracle Connection</TITLE>
</HEAD>
<BODY>
<%
    Connection conn = null;
    try
    {
        Class.forName("oracle.jdbc.driver.OracleDriver");
        conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:XE", "login", "pass");
        out.println("connected....!!");

    }

    catch(Exception e)
    {
        out.println("Exception : " + e.getMessage() + "");
    }


%>
</BODY>
</HTML>
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create DB user with admin rights 

CREATE USER username IDENTIFIED BY password;
then separately grant privileges with ADMIN OPTION;
GRANT dba TO username WITH ADMIN OPTION;
 
SQL> alter user marek identified by pass;

User altered.
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how to make heap dump

how to make gc heap dump

1. [marek@localhost bin]$ jcmd 8560 GC.heap_dump /tmp/test1.dump
    8560:
    Heap dump file created
2. Read file

[marek@localhost bin]$ jhat -port 7777 -J-mx4G /tmp/test1.dump
Reading from /tmp/test.dump...
Dump file created Mon Apr 07 15:04:00 CEST 2014
Snapshot read, resolving...
Resolving 819250 objects...
Chasing references, expect 163 dots...................................................................................................................................................................
Eliminating duplicate references...................................................................................................................................................................
Snapshot resolved.
Started HTTP server on port 7777
Server is ready.
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jcmd - very usefull tool

jcmd - new diagnistic tool from jdk 7 package. Very usefool in all jvm administration processes.

very small example:

1. man jcmd
2. jcmd - process list
3. available options to run

[marek@localhost mb]$ jcmd 7607 help
7607:
The following commands are available:
VM.native_memory
VM.commercial_features
ManagementAgent.stop
ManagementAgent.start_local
ManagementAgent.start
Thread.print
GC.class_histogram
GC.heap_dump
GC.run_finalization
GC.run
VM.uptime
VM.flags
VM.system_properties
VM.command_line
VM.version
help

.....


[marek@localhost mb]$ jcmd 8560 PerfCounter.print | grep java.property.java.vm
java.property.java.vm.info="mixed mode"
java.property.java.vm.name="Java HotSpot(TM) 64-Bit Server VM"
java.property.java.vm.specification.name="Java Virtual Machine Specification"
java.property.java.vm.specification.vendor="Oracle Corporation"
java.property.java.vm.specification.version="1.7"
java.property.java.vm.vendor="Oracle Corporation"
java.property.java.vm.version="24.51-b03"



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