B4J Question jssc version question

gpa · Jun 2, 2021

Hi...
I need to use an older jssc.jar for use with Pi zero (as advised in https://www.b4x.com/android/forum/threads/jserial-fatal-error.111854/)

I already have the up to date jssc.jar in my additional libs folder.

I think jssc.jar is used by jserial.jar? So presumably I have to switch the two differing copies of jssc in and out of the libs folder in order to switch versions?

Thanks....

Erel · Jun 3, 2021

Another option is to remove the DependsOn line from the library XML and reference the correct file with #AdditionalJar. This will allow you to make a different build configuration for each target.

B4X:

#If RPI
 #AdditionalJar: jssc_old.jar
#else
 #AdditionalJar: jssc_new.jar
#end if

gpa · Jun 3, 2021

Ah! That sounds perfect!
I'll give it a go - thanks!

gpa · Jun 3, 2021

And it works fine!

Is there something similar for using different jdk versions, rather than editing the "paths" setting every time?

Thanks!

Erel · Jun 4, 2021

Of course.

See the first search result: https://www.b4x.com/android/forum/pages/results/?query=b4j+java+version (#JavaCompilerPath)

gpa · Jun 4, 2021

Brilliant!
You are always a step ahead!

Thanks!

gpa · Jun 4, 2021

Ok - probably done something dumb but I get this when control clicking the java 8 link:

B4X:

Added at top of file:

'Compile with Java 8:  ide://run?file=%B4X%\ProjectCompiler.jar&VMArgs=-Db4x%3D%B4X%&Args=-Task%3DBuild&Args=-BaseFolder%3D..&VMArgs=-Djavabin%3DC:\Java\jdk1.8.0_291\bin


Project Compiler v1.00
javabin: C:\Java\jdk1.8.0_291\bin
Exit code: 1
StdOut: B4JBuilder v8.90
Global Java version: 8
BaseFolder: ..
StdErr: System.Exception: Multiple projects found. Please set the Project property.
   at ho.x()
   at ho.a(String[] A_0)
   at ho.d(String[] A_0)
Multiple projects found. Please set the Project property.
Completed. Exit code: 0

Not sure what it means by multiple projects or the project property?

Thanks...

gpa · Jun 5, 2021

Ah.
fixed it - with ref to https://www.b4x.com/android/forum/threads/b4abuilder-b4jbuilder-command-line-compilation.50154/

Working fine now - thanks!

B4J Question jssc version question

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