Eclipse Question Mac and PC

[sandyw]

I have a question for Eclipse user.
I have a PC at work and a Mac at home.
Do you know if these two operate differently.
ie for instance the Scanner seems to operate differently. printf is diffrent.
Maybe that is one reason I can not figure why my projects are not working right.

sandy

[r035198x]

I have a question for Eclipse user.
I have a PC at work and a Mac at home.
Do you know if these two operate differently.
ie for instance the Scanner seems to operate differently. printf is diffrent.
Maybe that is one reason I can not figure why my projects are not working right.

sandy

How different are they? Are you getting different results with them?

[sandyw]

They will show up as errors unless you add a statement (value or code) to it.

[JosAH]

They will show up as errors unless you add a statement (value or code) to it.

Do you have the same runtime version for Java installed on both of your machines?

kind regards,

Jos

[sandyw]

Do you have the same runtime version for Java installed on both of your machines?

kind regards,

Jos

On my Mac I have 3.2.2 at work I think I have the latest version. Will need to check on that one.
When I'm using the scanner on the mac it as if I want to: (ie Quick fix)
import Scanner (com.sun.tools.javac.v8.parser
import Scanner (sun.tools.jaa
Create class Scanner
Create interface scanner
Change to Signer (java Security
Create emun Scanner
rename in faile
add type parameter Scanner to fid Employee().

for printf
change to print(...)
add cast to System.out
rename in file

These are just a few things that seem to be diffrent.

thanks
sandy

[JosAH]

On my Mac I have 3.2.2 at work I think I have the latest version. Will need to check on that one.
When I'm using the scanner on the mac it as if I want to: (ie Quick fix)
import Scanner (com.sun.tools.javac.v8.parser
import Scanner (sun.tools.jaa
Create class Scanner
Create interface scanner
Change to Signer (java Security
Create emun Scanner
rename in faile
add type parameter Scanner to fid Employee().

for printf
change to print(...)
add cast to System.out
rename in file

These are just a few things that seem to be diffrent.

thanks
sandy

I was talking about the version of your Java runtime, not Eclipe's version. btw,
you're not supposed to import anything from com.sun.tools.* yourself. The
Scanner class is in the package java.util.

I'm afraid it's an installation issue. The Scanner class is available starting at
Java 1.5. It seems that on your Mac Eclipse can't find it and accidentally finds
a Scanner class in the com.sun.tools.javac package and goed totally berzerk
afterwards. You're also not supposed to add the tools.jar to Eclipse's build
path. The tools.jar is for Sun's own JDK (development tools) which isn't needed
by Eclipse.

Are you, by any chance, developing JSPs? (just a guess)

kind regards,

Jos

[sandyw]

I was talking about the version of your Java runtime, not Eclipe's version. btw,
you're not supposed to import anything from com.sun.tools.* yourself. The
Scanner class is in the package java.util.

I'm afraid it's an installation issue. The Scanner class is available starting at
Java 1.5. It seems that on your Mac Eclipse can't find it and accidentally finds
a Scanner class in the com.sun.tools.javac package and goed totally berzerk
afterwards. You're also not supposed to add the tools.jar to Eclipse's build
path. The tools.jar is for Sun's own JDK (development tools) which isn't needed
by Eclipse.

Are you, by any chance, developing JSPs? (just a guess)

kind regards,

Jos

Hi Jos:
I did a search on my mac for Java Run time, There was no Java Run time listed. also I don't think I'm develping JSP
When I'm use eclipe I click on New Projects. I select Java
Then double click Java Project. I click the next button.
Type in a Project Name (Employee).
Click the Finish button.

When Im in the Project Window
Under the JRE I'm using the default which is JRE Current jvm 1.4.2
thanks
Sandy

[r035198x]

Hi Jos:
I did a search on my mac for Java Run time, There was no Java Run time listed. also I don't think I'm develping JSP
When I'm use eclipe I click on New Projects. I select Java
Then double click Java Project. I click the next button.
Type in a Project Name (Employee).
Click the Finish button.

When Im in the Project Window
Under the JRE I'm using the default which is JRE Current jvm 1.4.2
thanks
Sandy

Yep, Like Jos said, you will need 1.5 for the java.util.Scanner to work.

[JosAH]

When Im in the Project Window
Under the JRE I'm using the default which is JRE Current jvm 1.4.2
thanks
Sandy

Carefully reread my reply #6 again. Your PC and you Mac run different Java
versions. You need at least version 1.5 (you've got that installed on your PC)
but your Mac has version 1.4.2. installed which doesn't have a Scanner class.

But worse is that Eclipse on your Mac has a wrong builder path, i.e. it can
find *another* Scanner thing which actually is part of Sun's tools.jar. Eclipse
is not supposed to find that one because it contains packages and classes
that are not for public use. You should remove that tools.jar from your build path.

kind regards,

Jos

[sandyw]

Thanks Jos the info


Where do I find the tools.jar. Will it be located in the plug in folder or do I have to find it in the Pref section in Eclipse.

Sandy,
PS

[JosAH]

Thanks Jos the info


Where do I find the tools.jar. Will it be located in the plug in folder or do I have to find it in the Pref section in Eclipse.

Sandy,
PS

Select your project then go to your menu bar and select:
Project>Properties>Java Build Path. Then select the "libraries" tab and see
if that tools.jar is there; if it is, remove it.

kind regards,

Jos

[sandyw]

Thanks Jos I will look into that one.

sandy

[sandyw]

Select your project then go to your menu bar and select:
Project>Properties>Java Build Path. Then select the "libraries" tab and see
if that tools.jar is there; if it is, remove it.

kind regards,

Jos

Never did find tool.jar in the libraries. There was on item in the library.
and I open it to see what was in it. no listing of tools.jar.
Sorry I do not have the name of that file.
Should I just delete it anyways. On my PC there is no listing at in the library.

thanks
Sandyw

[JosAH]

Never did find tool.jar in the libraries. There was on item in the library.
and I open it to see what was in it. no listing of tools.jar.
Sorry I do not have the name of that file.
Should I just delete it anyways. On my PC there is no listing at in the library.

thanks
Sandyw

I think (just a guess) that you fell in a silly Sun trap: when you just install
a JRE (Java Runtime Environment) you get one JRE/lib directory on your
machine. When you install a JDK however (Java Development Kit) you get
*two* JREs, one for you and one for internal use. The JDK also has another
/lib subdirectory which contains the tools.jar file.

Don't remove anything for now but also don't import any class coming from
the com.sun.* packages. Not even when Eclipse suggests to do so.

I can't give any more detailed help without scrutinizing your installation.

kind regards,

Jos

[sandyw]

I think (just a guess) that you fell in a silly Sun trap: when you just install
a JRE (Java Runtime Environment) you get one JRE/lib directory on your
machine. When you install a JDK however (Java Development Kit) you get
*two* JREs, one for you and one for internal use. The JDK also has another
/lib subdirectory which contains the tools.jar file.

Don't remove anything for now but also don't import any class coming from
the com.sun.* packages. Not even when Eclipse suggests to do so.

I can't give any more detailed help without scrutinizing your installation.

kind regards,

Jos

Thanks Jos
I just going uninstall it and find another version where I have control over it.
Thanks again for the time you have given me. We let you know what the out come is.
sandyw

[sandyw]

I think (just a guess) that you fell in a silly Sun trap: when you just install
a JRE (Java Runtime Environment) you get one JRE/lib directory on your
machine. When you install a JDK however (Java Development Kit) you get
*two* JREs, one for you and one for internal use. The JDK also has another
/lib subdirectory which contains the tools.jar file.

Don't remove anything for now but also don't import any class coming from
the com.sun.* packages. Not even when Eclipse suggests to do so.

I can't give any more detailed help without scrutinizing your installation.

kind regards,

Jos

Well I end up re formatting my Mac. I also found out that the problems is with the mac when it load updates for java because I installed Eclipse and tried to and it do not work it gave a window list errors. I then updated the system and tried again to run Eclipse, and I got a copy of errors on my project, mostly the scanner error.
I need to goto Eclipse website to see if there is away around this.

thanks again Jos
Sandyw

[JosAH]

Fire up a shell and type "java -version". If you see a 1.4.x version it's not
Eclipse to blame. You need version 1.5 or later for the Scanner class.
Eclipse is just an IDE and can deal with several Java versions.

kind regards,

Jos

[sandyw]

Fire up a shell and type "java -version". If you see a 1.4.x version it's not
Eclipse to blame. You need version 1.5 or later for the Scanner class.
Eclipse is just an IDE and can deal with several Java versions.

kind regards,

Jos

I alway thought it was Eclipse that's way I did a reformat for because you gave me a clue it wasn't and I was hoping that when I did a reformat the problem would not appear. I will look into your suggestion.
Thanks Jos for the help and looking forward for more help either on this site or the other one.
Sandyw or sandyR

[beatTheDevil]

Sandy, your problem may have something to do with the fact that Apple, being somewhat stubborn and stingy with the implementation details of their operating system, doesn't allow Sun to write Java for the Mac. They write their own version and install it on their computers.

At the moment, only Java 1.5.x is available for Mac users. It looks like you need to upgrade from 1.4.2, so go to Apple's website, not Sun's or Eclipse's, and search for a Java download.

Hope that helps!

[sandyw]

Sandy, your problem may have something to do with the fact that Apple, being somewhat stubborn and stingy with the implementation details of their operating system, doesn't allow Sun to write Java for the Mac. They write their own version and install it on their computers.

At the moment, only Java 1.5.x is available for Mac users. It looks like you need to upgrade from 1.4.2, so go to Apple's website, not Sun's or Eclipse's, and search for a Java download.

Hope that helps!

thanks for the tip. Will look into it. I think I have that version

Sandyw