How to compile in Java Source???

Hello,
I'm studying a way to compile java files to class files in the java source. I have use the sun.tools.javac.Main to do this, but I have noticed that it aint recomended to use. I also wan't to get the possible errors from the compiler (if java file was wrongly made). The problem using the sun.tools.javac.Main is that it won't guarantee that it works in every platform or in future releases of JDK. Does the JDK 1.4 even support it? (My IDE environment prevents to use JDK 1.4). So the question is: is there a way to compile on the fly (to memory or to class files)? Do I really have to run some external process that compiles the file and then try to get somehow possible errors? That seems to me litle too indecent to use. Any suggestions?
Thanks,
Petri Tuomaala

Hi guys,
I have also needed to compile Java source from within a Java application. Here is the best solution I came up with:
Process proc = Runtime.getRuntime().exec( "
C:\\Temp\\Jikes -bootclasspath C:\\jdk\\jre\\lib\\rt.jar C:\\Java\\com\\sts\\utility\\Utility.java" );
BufferedReader br = new BufferedReader( new InputStreamReader( proc.getErrorStream() ) );
String line = null;
while( (line = br.readLine()) != null ) {
System.out.println( line );
proc.waitFor();
I used Jikes http://oss.software.ibm.com/developerworks/opensource/jikes/ because it compiled my source quicker than Javac did - 250 millseconds for Jikes compared to 2750 milliseconds for Javac.

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{color:0000ff}http://forum.java.sun.com/thread.jspa?threadID=5277791
{color}
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I accidentally downloaded source DVD "Oracle Linux Release 5 Update 2 source - DVD" instead of installable ISO image. Is there anyway I can compile it to make bootable ISO image?
I tried to search this forum as well as other places but couldn't find any information hence thought of opening a thread before I proceed to download correct file which will again take 10+ hrs with my Internet speed :(
Any help is highly appreciated. Also I need to know which packages are required to be installed for compiling the source if at all that is possible. I am using Ubuntu 11.10 Desktop.
Thanks in advance for any help and hope to get a reply soon :) I need to urgently install Oracle 11gR2 on it.
Edited by: user6582219 on Apr 12, 2012 1:10 AM
While browsing the forum for any possible solution I came to a thread that discuss installation of a package oracle-rdbms-server-11gR2-preinstall. When searched through search engine I came to know about recent certification Oracle 11gR2 on Oracle Linux 6, here is the link https://blogs.oracle.com/linux/entry/announcing_oracle_database_11g_r2
https://blogs.oracle.com/linux/entry/announcing_oracle_database_11g_r2
Thing is I already have Oracle Linux 6 Update 2 (the latest) installed on my machine in dual boot mode so I dropped the idea of installing version 5.2. As per the documentation 11gR2 was not certified earlier on Linux 6.2 so I thought of installing 5.2 but it is not necessary now.
I would still appreciate if someone could answer my question just for knowing the procedure compiling source. May be it can help someone else trying to achieve this.
I have another couple of important questions and need guidance from the experts over here. I am not sure if it is appropriate to open a new thread but for now I am posting them here.
Before proceeding here are my environment details:
Machine: x86 32 bit with 2 GB RAM/250 GB HD.
OS: Kubuntu 11.10 Desktop and Oracle Linux 6 Update 2 in dual boot mode.
Here are my partition details for your reference but as I am planning to do the installation from the scratch following new ideal scheme you can jump to last paragraph following the line "*********************************" for my questions.
Unfortunately my partition plan went wrong and here is what I have now:
Disk /dev/sda: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders, total 488397168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x3d5ba9e1
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1002047 500000 83 Linux
/dev/sda2 151525080 361253654 104864287+ 7 HPFS/NTFS/exFAT
/dev/sda4 1003518 151001087 74998785 5 Extended
/dev/sda5 1003520 7002111 2999296 82 Linux swap / Solaris
/dev/sda6 7004160 11001855 1998848 83 Linux
/dev/sda7 11003904 51001343 19998720 83 Linux
/dev/sda8 51003392 110041087 29518848 83 Linux
Partition table entries are not in disk order
/dev/sda1 here is /tmp, /dev/sda2 is my data partition, I have separate /home / (root) partition for Kubuntu and remianing around 20 GB in extended partition is used for Oracle Linux 6.2 with default Oracle suggested LVM partition. I also have separate /boot for Kubuntu and I chose not to install grub while installing Oracle Linux. I later modified grub.cfg to add entries for Oracle Linux and now I can boot both OSs successfully.
My issue now is I cannot extend 20 GB space (in extended partition) that I have given to Oracle though I have around 40 GB space available. This is because I alreay have 4 primary partitions (one for /boot others for "data" and one extended partition). So I have to make primary partition out of free space and install Oracle in a single partition without following recommended partition layout scheme.
Now I want to do the installation of both the OS from the scratch and really need an advice on partition layout scheme. Here is summary of what I wan to achieve:
1. Keep the "data" partition (primary) intact and carve an ideal partition layout for both the OS with separate /boot, /tmp, /home, swap (and may be for /usr???). Also may be I can share swap?
2. How do I go about using LVM and is it recommended for this case? What would be ideal locations for each partitions and sizes? I already used 100 GB for "data" so now I want to keep 60 GB for Oracle Linux (and Oracle DB for which I will again make few sub-partitions) and remaining will be for Kubuntu.
Well, I am not sure if this is the right place to ask these questions but since I can see very knowlegeable top contributors here that are willing to help novice users I thought of posting these questions.
I would really really appreciate if someone can provide me rough draft of partition scheme in my case considering the sub-partitions needed for Oracle DB. I went thorugh number of forums and documentations to come up with solutuion and finally thought of getting help after much confusion.
I really need to carefully plan this time because it's third time I am doing reinstallation from the scratch because of poor plan I followed previously.
Thank you very much in advance and please let me know in case more information is needed from my side.
Regards,
Ramesh

I accidentally downloaded source DVD "Oracle Linux Release 5 Update 2 source - DVD" instead of installable ISO image. Is there anyway I can compile it to make bootable ISO image?Google will be your best friend for such a question, for instance, "Creating a Custom centos Linux bootable ISO Image". There is no need to duplicate the effort. I recommend you download the correct installation DVD, e.g. 5.8
Thing is I already have Oracle Linux 6 Update 2 (the latest) installed on my machine in dual boot mode so I dropped the idea of installing version 5.2. As per the documentation 11gR2 was not certified earlier on Linux 6.2 so I thought of installing 5.2 but it is not necessary now.So you don't need to install 5.2 anymore, but you want the information how to compile a installation DVD from the 5.2 source anyway?!
I have another couple of important questions and need guidance from the experts over here. I am not sure if it is appropriate to open a new thread but for now I am posting them here.Questions may be important for you, but not necessarily for others. No one will complain if you create a new thread for particular questions or subjects. It is better to separate your topics and questions rather than creating a multi-mega thread, which does little to help anyone else but you. It means more work on your end, but it will be easier for anyone to participate or answer your questions, and it will allow you to better award answers.
Regarding your partitioning questions: It is generally difficult to address such topics in a forum. You are asking for a book of information. My advice is to drop the old fashioned concepts of dual or triple boot options and install Oracle VirtualBox instead. It will make all of these questions obsolete and you can use whatever defaults when installing your virtual machine guest OS. Its a far more superior way of dealing with multiple operating systems on one and the same computer.
I am using Ubuntu 11.10 Desktop.
I need to urgently install Oracle 11gR2 on it.For what it's worth, if you can combine the two source below you should be able to install and run 11gR2 on Ubuntu 11.10.
Install Oracle 11gR2 on Ubuntu Linux 11.04 (64-bit) Howto
Install Oracle 11gR2 on Ubuntu Linux 11.04 (64-bit) Howto
Oracle 11gR2 Express Edition on Linux Ubuntu 11.10 howto
Oracle 11gR2 Express Edition on Linux Ubuntu 11.10 howto
However, check out VirtualBox.

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