jakarta ee动态编译java类web项目
我正在开发一个web应用程序,在这里我可以导入java代码,编译并执行它。 这个类可能有一些来自其他库的导入,这些库是我添加到我的类路径中的。 作为桌面应用程序运行,它可以工作,但在wildfly 9.0.2下运行时,它找不到我的类路径库,因此,我在编译代码时出错
我是否必须更改wildfly配置的任何设置?我尝试了有maven和没有maven的代码
我使用这个库来编译我的代码,就像我说的,它使用类似桌面的应用程序来工作:https://github.com/trung/InMemoryJavaCompiler
错误:
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.*;
错误消息将与所有其他导入库一起继续 然后,classformaterror:
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
编辑: 我使用EclipseMars在Webcontent/web inf/lib文件夹下添加了我的libs,然后右键单击add to build path
编辑2: 类负责创建代码并获得结果:
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();
}
}
我创建了一个扩展库的类,并更改了使用父类加载器:
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);
}
}
xhtml:
<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>
我按照您的建议通过了父类加载器测试,但也不起作用
第一个类“TestController”从它工作的主方法执行
编辑:
我添加了以下代码,可以在其中使用libs设置类路径:
// 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());
作为Java应用程序执行时,返回:
[-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;]
作为Web应用程序执行:
[-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;]
我怎么能得到同样的结果
# 1 楼答案
感谢@victor bello提供的伟大解决方案。 我的解决方案如下所示:
从github复制InMemoryJavaCompiler代码源并重写:
MemoryCompilerTest中的公共类在MemoryJavaCompiler{
}
调用编译方法:
Class testClass=inMemoryCompilerTest。编译(Thread.currentThread()。getContextClassLoader(),“com.namespace.here.ClassName”,someCode,stringBuilder。toString())
# 2 楼答案
让它工作起来
我必须做出@NicolasFilotto提到的改变,在使用webapp时使用父类加载器。 在那之后,对于JavaCompiler工作,当我使用外部库时,有必要像上次编辑时提到的那样传递我的类路径。 基本上,代码更改为:
使用wildfly,我不得不将
URLClassLoader urlClassLoader = (URLClassLoader) parent;
更改为Enumeration<URL> resources = parent.getResources("/");
# 3 楼答案
@VictorBello I已经在Dynamic Loader中实现了这些功能。甚至可以在运行时在Dynamic Loader中包含Jar