动态编译Java类的Web项目

Question

我正在开发一个web应用程序，我可以导入Java代码，编译，然后执行它。这个类可能有从其他图书馆，我加入到我的类路径一些进口。运行它作为一个桌面应用程序，它的工作原理，但在wildfly运行9.0.2没有找到我的类路径库等等，我有错误编译我的代码。

我一定要改变wildfly配置任何设置？我想我的代码使用和不使用Maven的。

我使用这个库编译我的代码，就像我说的，它使用像桌面应用程序的工作：qazxsw POI

错误：

https://github.com/trung/InMemoryJavaCompiler

错误消息继续与所有其他的导入库，然后将classformaterror：

13:44:57,686 ERROR [stderr] (default task-5) /br/com/project/webtest/service/CompileClass.java:2: error: package org.junit does not exist
13:44:57,686 ERROR [stderr] (default task-5) import static org.junit.Assert.*;
13:44:57,686 ERROR [stderr] (default task-5)                        ^
13:44:57,687 ERROR [stderr] (default task-5) /br/com/project/webtest/service/CompileClass.java:3: error: cannot find symbol
13:44:57,687 ERROR [stderr] (default task-5) import br.com.project.webtest.service.SeleniumService;
13:44:57,688 ERROR [stderr] (default task-5)                                               ^
13:44:57,688 ERROR [stderr] (default task-5)   symbol:   class SeleniumService
13:44:57,688 ERROR [stderr] (default task-5)   location: package br.com.project.webtest.service
13:44:57,689 ERROR [stderr] (default task-5) /br/com/project/webtest/service/CompileClass.java:4: error: package org.junit does not exist
13:44:57,689 ERROR [stderr] (default task-5) import org.junit.*;

编辑：我添加使用eclipse火星，在WebContent / WEB-INF / lib文件夹下，加入我的库，然后右键单击，添加到构建路径。

编辑2：类负责创建的代码，并得到结果：

13:44:57,751 WARNING [javax.enterprise.resource.webcontainer.jsf.lifecycle] (default task-5) #{testController.action()}: java.lang.ClassFormatError: Truncated class file: javax.faces.FacesException: #{testController.action()}: java.lang.ClassFormatError: Truncated class file

我创建了扩展lib和改变使用父类加载器的类：

package br.com.test;

import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Paths;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

@ManagedBean
@SessionScoped
public class TestController {

    public void actionParent() {
        String javaCode = generateJavaCode();
        Class<?> compile = null;
        try {
            compile = InMemoryCompilerTest.compile(Thread.currentThread().getContextClassLoader(),
                    "br.com.project.webtest.service.CompileClass", javaCode);
            System.out.println("Worked: " + compile);
        } catch (Exception e) {
            e.printStackTrace();
        }           
    }

    public void actionClassLoader() {
        String javaCode = generateJavaCode();
        Class<?> compile = null;
        try {
            compile = InMemoryCompilerTest.compile("br.com.project.webtest.service.CompileClass", javaCode);
            System.out.println("Worked: " + compile);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    static String readFile(String path, Charset encoding) throws IOException {
        byte[] encoded = Files.readAllBytes(Paths.get(path));
        return new String(encoded, encoding);
    }

    private static String generateJavaCode() {
        String java = "package br.com.project.webtest.service;\r\n" 
                    + "import static org.junit.Assert.*;\r\n"
                    + "public class CompileClass {\r\n" 
                    + " public CompileClass() {\r\n"
                    + "     System.out.println(\"Dynamically compiled\");\r\n"
                    + "     String text = \"Testing JUnit lib\";\r\n"
                    + "     assertEquals(\"Testing JUnit lib\", text);\r\n" 
                    + "     System.out.println(\"completed\");\r\n"
                    + " }\r\n" + "  public static void main(String[] args) {\r\n" 
                    + "     new CompileClass();\r\n"
                    + "     System.out.println(\"finish\");\r\n" 
                    + " }\r\n" 
                    + "}\r\n";

        return java;

    }

    public static void main(String[] args)  {
        TestController c = new TestController();
        c.actionClassLoader();
        c.actionParent();
    }

}

XHTML：

public class InMemoryCompilerTest extends InMemoryJavaCompiler {
    static JavaCompiler javac = ToolProvider.getSystemJavaCompiler();

    public static Class<?> compile(ClassLoader parent, String className, String sourceCodeInText) throws Exception {
        SourceCode sourceCode = new SourceCode(className, sourceCodeInText);
        CompiledCode compiledCode = new CompiledCode(className);
        Iterable<? extends JavaFileObject> compilationUnits = Arrays.asList(sourceCode);
        DynamicClassLoader cl = new DynamicClassLoader(parent);
        ExtendedStandardJavaFileManager fileManager = new ExtendedStandardTest(
                javac.getStandardFileManager(null, null, null), compiledCode, cl);
        JavaCompiler.CompilationTask task = javac.getTask(null, fileManager, null, null, null, compilationUnits);
        boolean result = task.call();
        return cl.loadClass(className);
    }
}

public class ExtendedStandardTest extends ExtendedStandardJavaFileManager{

    protected ExtendedStandardTest(JavaFileManager fileManager, CompiledCode compiledCode, DynamicClassLoader cl) {
        super(fileManager, compiledCode, cl);
    }

}

我测试如你所说，但也没有工作，通过父类加载器。

第一类“的TestController”从它的工作原理主要方法执行。

编辑：

我已经添加了下面的代码，我可以设定我的库类路径：

<html xmlns="http://www.w3.org/1999/xhtml" xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html">

<h:head></h:head>
<h:body>

    <h:form>

        <h:commandButton action="#{testController.actionClassLoader()}" value="ClassLoader" />
        <h:commandButton action="#{testController.actionParent()}" value="Parent" />
    </h:form>
</h:body>
</html>

执行，因为它返回一个Java应用程序：

// set the classpath
        List<String> options = new ArrayList<String>();

        options.add("-classpath");
        StringBuilder sb = new StringBuilder();
        URLClassLoader urlClassLoader = (URLClassLoader) parent;

        for (URL url : urlClassLoader.getURLs()) {
            sb.append(url.getFile()).append(File.pathSeparator);
        }
        options.add(sb.toString());

执行为Web应用程序：

[-classpath, /C:/Users/dev/Automacao/workspace/test/build/classes/;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/InMemoryJavaCompiler-1.2.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/commons-io-2.5.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/workspace_libs/client-combined-3.0.0-beta3-nodeps.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/workspace_libs/commons-codec-1.10.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/workspace_libs/commons-exec-1.3.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/workspace_libs/commons-logging-1.2.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/workspace_libs/gson-2.3.1.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/workspace_libs/guava-19.0.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/workspace_libs/hamcrest-core-1.3.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/workspace_libs/hamcrest-library-1.3.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/workspace_libs/httpclient-4.5.2.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/workspace_libs/httpcore-4.4.4.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/workspace_libs/httpmime-4.5.2.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/workspace_libs/jna-4.1.0.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/workspace_libs/jna-platform-4.1.0.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/workspace_libs/junit-4.12.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/workspace_libs/netty-3.5.7.Final.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/workspace_libs/phantomjsdriver-1.3.0.jar;/C:/Users/dev/Automacao/workspace/test/WebContent/WEB-INF/lib/workspace_libs/cglib-nodep-3.2.4.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/annotations-api.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/catalina-ant.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/catalina-ha.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/catalina-storeconfig.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/catalina-tribes.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/catalina.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/ecj-4.3.1.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/el-api.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/jasper-el.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/jasper.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/jsp-api.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/servlet-api.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/tomcat-api.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/tomcat-coyote.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/tomcat-dbcp.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/tomcat-i18n-es.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/tomcat-i18n-fr.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/tomcat-i18n-ja.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/tomcat-jdbc.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/tomcat-jni.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/tomcat-spdy.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/tomcat-util-scan.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/tomcat-util.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/tomcat-websocket.jar;/C:/Program%20Files/Apache%20Software%20Foundation/Apache%20Tomcat%208.0.3/lib/websocket-api.jar;/C:/Users/dev/Automacao/workspace/libraries/JSF%202.2%20(Mojarra%202.2.0)/mojarra-2.2.0-FCS/lib/javax.faces.jar;]

我怎么能得到相同的结果？

Answer 1

搞不定。

我必须作出由@NicolasFilotto提到这种变化，使用Web应用程序时使用的父类加载器。在此之后，对于JavaCompiler进行工作，因为我使用外部库，有必要像我上次编辑提到的通过我的类路径中。基本代码更改为：

[-classpath, /C:/Users/dev/Automacao/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/test/WEB-INF/classes/;/C:/Users/dev/Automacao/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/test/WEB-INF/lib/commons-io-2.5.jar;/C:/Users/dev/Automacao/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/test/WEB-INF/lib/InMemoryJavaCompiler-1.2.jar;/C:/Users/dev/Automacao/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/test/WEB-INF/lib/javax.faces.jar;]

使用wildfly我不得不改变public static Class<?> compile(ClassLoader parent, String className, String sourceCodeInText) throws Exception { SourceCode sourceCode = new SourceCode(className, sourceCodeInText); CompiledCode compiledCode = new CompiledCode(className); Iterable<? extends JavaFileObject> compilationUnits = Arrays.asList(sourceCode); DynamicClassLoader cl = new DynamicClassLoader(parent); ExtendedStandardJavaFileManager fileManager = new ExtendedStandard( javac.getStandardFileManager(null, null, null), compiledCode, cl); // set the classpath List<String> options = new ArrayList<String>(); options.add("-classpath"); StringBuilder sb = new StringBuilder(); Enumeration<URL> resources = parent.getResources("/"); while (resources.hasMoreElements()) { URL url = resources.nextElement(); sb.append(url.getFile()).append(File.pathSeparator); } options.add(sb.toString()); // execute the compiler Boolean call = javac.getTask(null, fileManager, null, options, null, compilationUnits).call(); if (call) { return cl.loadClass(className); } return null; }到URLClassLoader urlClassLoader = (URLClassLoader) parent;

Answer 2

@VictorBello我已经实现了Enumeration<URL> resources = parent.getResources("/");这些功能。即使你可以包括在Dynamic Loader运行时JAR

Dynamic Loader

Answer 3

感谢@胜利者贝洛的理想解决方案。我的解决办法是这样的：

需要所有jar从Maven仓库复制到一个文件夹和该文件夹中分发带有应用程序：public void DynamicJarCodeTest() throws Exception { try { StringBuilder sourceCode = new StringBuilder(); sourceCode.append("package org.dvare.dynamic;\n"); sourceCode.append("import org.apache.commons.math3.Field;\n"); sourceCode.append("public class SourceClass {\n"); sourceCode.append(" public String test() { \n"); sourceCode.append(" return \"inside test method\";\n"); sourceCode.append(" }\n"); sourceCode.append("}"); DynamicCompiler dynamicCompiler = new DynamicCompiler(); dynamicCompiler.setSeparateContext(true); dynamicCompiler.setUpdateContextClassLoader(false); dynamicCompiler.addJar(getClass().getClassLoader().getResource("commons-math3.jar")); dynamicCompiler.addSource("org.dvare.dynamic.SourceClass", sourceCode.toString()); dynamicCompiler.build(); Class aClass = Class.forName("org.apache.commons.math3.Field", false, dynamicCompiler.getClassLoader()); Assert.assertNotNull(aClass); Class bClass = Class.forName("org.dvare.dynamic.SourceClass", false, dynamicCompiler.getClassLoader()); Assert.assertNotNull(bClass); } catch (DynamicCompilerException e) { System.out.println(e.getErrorList()); } catch (Exception e) { e.printStackTrace(); } }
从他们身上产生的javac（笨的方法）的类路径：
复制InMemoryJavaCompiler从GitHub和重写代码源：公共类InMemoryCompilerTest扩展InMemoryJavaCompiler { }
调用编译方法：类识别TestClass = inMemoryCompilerTest.compile（Thread.currentThread（）getContextClassLoader（）， “com.namespace.here.ClassName”，someCode，stringBuilder.toString（））;

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