aws lambda java：如何在动态编译时设置 class 路径

Question

我正在构建一个 AWS Lambda 函数，它可以即时编译 class。但是 lambda 函数会抛出错误，因为它无法定位依赖项，即动态编译的 class 的导入语句。我已经给出了所遵循步骤的示例代码。

请指导我如何找到依赖项，即设置 class 路径，以便动态创建的 class 编译时没有任何错误

Sample Code being compiled

private String constructTestCode(String methodCode) throws Exception{
StringBuffer strMethod = new StringBuffer();
strMethod.append("import org.json.simple.JSONObject;");
strMethod.append("public class TestJavaFile {");
strMethod.append("public void testSample() {");         
strMethod.append("JSONObject j = new JSONObject();");       
strMethod.append("}");
strMethod.append("}");
return strMethod.toString();
}

JavaCompilerCode

JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
List<String> optionList = new ArrayList<String>();      
optionList.addAll(Arrays.asList("- 
  classpath",System.getProperty("java.class.path")));

if (compiler == null) {
    try {

        Class<?> javacTool = 
        Class.forName("com.sun.tools.javac.api.JavacTool");
        Method create = javacTool.getMethod("create");
        compiler = (JavaCompiler) create.invoke(null);
        compiler.getTask(null, null, null, optionList, null, null);
    } catch (Exception e) {
        throw new AssertionError(e);
    }
}
 try {

    compiler.run(null, null, null, 
      javaFile.toFile().getAbsolutePath());
 } catch (Exception e) {
    context.getLogger().log("Exception " + e + "\n");
 }

return javaFile.getParent().resolve(fileName + ".class");

Gradle one fat jar

task customFatJar(type: Jar) {
manifest {
  attributes 
  'Class-Path': configurations.runtime.files.collect { it.name }.join(' 
')
}
baseName = 'all-in-one-jar'
from { configurations.compile.collect { it.isDirectory() ? it : 
zipTree(it) 
} }
with jar
}

Error while executing the lambda function

/tmp/TestJavaFile.java:1: error: package org.json.simple does not exist

编译文件保存在/tmp目录下。我无法确定依赖 jar 文件所在的路径以及如何在 classpath 中设置它。请指导这一点。

非常感谢！

Answer 1

通过将类路径设置为

解决了这个问题

    try {
        StandardJavaFileManager standardJavaFileManager = 
                   compiler.getStandardFileManager(null, null, null);
        standardJavaFileManager.setLocation(StandardLocation.CLASS_PATH, 
                   listFilePaths(folder, context));
        File[] javaFiles = new File[] { javaFile.toFile(), 
        Paths.get("/tmp/JUnitTest.java").toFile() };

        Iterable<? extends JavaFileObject> compilationUnits1 = 
                 standardJavaFileManager
                .getJavaFileObjectsFromFiles(Arrays.asList(javaFiles));
        CompilationTask task = compiler.getTask(null, standardJavaFileManager, null, 
                 optionList, null,
                 compilationUnits1);
        task.call();
       } catch (Exception e) {
           context.getLogger().log("Exception " + e + "\n");
       }

aws lambda java：如何在动态编译时设置 class 路径

aws lambda java : How to set the class path while compiling on the fly

java

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amazon-web-services

aws-lambda