clojure.lang.Compiler.load(...) produces NullPointerException

[Alexey Matveev]

Hi,

First of all thanks for this project.

I want to use clojure from java side on android.

When I try load some clojure forms, like:

clojure.lang.Compiler.load(new StringReader("(+ 2 2)"));

NPE occurs inside DalvikDynamicClassLoader class.

java.lang.NullPointerException: Attempt to invoke virtual method 'char[] java.lang.String.toCharArray()' on a null object reference

at java.io.File.fixSlashes(File.java:185)

at java.io.File.<init>(File.java:134)

at clojure.lang.DalvikDynamicClassLoader.defineMissingClass(DalvikDynamicClassLoader.java:84)

at clojure.lang.DynamicClassLoader.defineClass(DynamicClassLoader.java:46)

at clojure.lang.Compiler$ObjExpr.getCompiledClass(Compiler.java:4808)

at clojure.lang.Compiler$FnExpr.parse(Compiler.java:3968)

at clojure.lang.Compiler.analyzeSeq(Compiler.java:6706)

at clojure.lang.Compiler.analyze(Compiler.java:6499)

at clojure.lang.Compiler.eval(Compiler.java:6764)

at clojure.lang.Compiler.load(Compiler.java:7194)

at clojure.lang.Compiler.load(Compiler.java:7159)

as I understand *compile-path* is not set and temporary compile directory can't  be created. 

I use 'clojure-1.7.0-alpha5.jar' from clojars

Thnaks in advance for help.

[Alexander Yakushev]

Hello Alexey,

To use dynamic compilation on Android you have first to initialize it. Neko does it by default when you call neko.init/init, but you can also do it manually (if you don't use Neko). This namespace is what you need http://clojure-android.github.io/neko/#neko.compilation

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[Alexey Matveev]

Thanks for reply.

This works well for me:

 final File cacheDir = new File(getCacheDir(), "clojure_repl");

            cacheDir.mkdirs();

            final String path = cacheDir.getAbsolutePath();

            System.setProperty("clojure.compile.path", path);

RT.var("clojure.core", "*compile-path*")

                    .alterRoot(Clojure.var("clojure.core", "str"), StringSeq.create(path));