August 2022 - armedbear-devel - mailman3.common-lisp.net

Setting different class loader
by Steven Nunez 06 Feb '23

06 Feb '23

Greetings all, I have what I think is a problem with the ABCL class loader. I am working with a 'big data' library, Spark, but run into an issue on line 2 of the programming guide example. I am able to load the JARs from Maven with the ASDF system definition: (asdf:defsystem #:spark :description "Wrapper for Spark 3.0" :serial t :defsystem-depends-on (abcl-asdf) :depends-on (#:jss #:javaparser) :components ((:mvn "org.apache.spark/spark-core_2.12" :version "3.0.0") (:file "package") (:file "spark"))) and can create a SparkConf object: (defvar *spark-conf* #1"new SparkConf() .setAppName("abcl-app") .setMaster("local")" ) But when I try to create a 'context' (defvar *sc* (new 'JavaSparkContext *spark-conf*)) I get an error in the initialisation: Java exception 'java.lang.NoClassDefFoundError: Could not initialize class org.apache.spark.package$'. There isn't much on this except from the Jenkins guys, who have attempted to put Spark and Spark applications into a CI system. They seem to think that it's related to a call to get a properties file in the package class and on a StackOverflow discussion suggested that "you should make sure that you set the classloader that Spark was loaded through using the Thread.currentThread().setContextClassLoader(myCustomLoader) call". I've verified with (java:dump-classpath) that the JAR is on the ABCL classpath, and the JAR file does contain the spark-version-info.properties file. I've also tried getting the file myself with: (defvar rs #1"Thread.currentThread() .getContextClassLoader() .getResourceAsStream("spark-version-info.properties")" ) which returns nil, so their theory may be correct. Messing around with class loaders is a bit beyond my 20 year old Java knowledge so I thought I'd ask here if anyone has any ideas on how I can load Spark in way to use the default Java class loader. Alternatively it occurs to me to ask why the ABCL class loader isn't able to find the properties file if the JAR is on the classpath and then to correct whatever that problem is. Cheers, Steve

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Constructing a java lambda expression?
by Alan Ruttenberg 25 Aug '22

25 Aug '22

There's a library I want to use that takes a lambda as an argument. Anyone know how to construct one in ABCL? Thanks, Alan

3 11

ASDF 3.3.6 is released
by Robert Goldman 07 Aug '22

07 Aug '22

Dear Lisp Implementation Developers and Maintainers, Today we release ASDF 3.3.6, the sixth bugfix release for the 3.3 release series, and -- it is devoutly to be hoped -- the final one. We urge implementations that are currently bundling previous versions of ASDF -- and especially those bundling 3.3.0 through 3.3.5 -- to upgrade to 3.3.6 at their earliest convenience. As maintainer, my primary role continues to be coordination and some limited quality control. The real work for this release has been done by many contributors and bug-reporters, to whom the Common Lisp community owes a tremendous vote of thanks. Their names are listed on the Changelog, appended below. An extra special thanks is due to my co-maintainer, Eric Timmons, who has provided many fixes and also has overhauled and much improved our regression testing. We *hope* that the next release will be 3.4, introducing new functionality but which, as the numbering suggests, will be backward compatible. Best, Robert * Fix bug loading ASDF system definitions from jar files on ABCL. See !190 * Fix bug with version numbering after reload. See !194 and #94. Thanks to Eric Timmons. * Fix bug in return value of UPGRADE-ASDF. See !195. Again, thanks to Eric Timmons. * Multiple improvements to documentation and tests. Thanks to Nathan Ringo and Phoebe Goldman. * Add clasp support for uiop/launch program. Thanks to Christian Schafmeister. * Miscellaneous minor bug fixes and tweaks. * Don't let *package* binding leak into ASDF compile operations. Thanks to Phoebe Goldman.

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