我正在尝试在隔离的类加载器中运行groovy脚本,以便它们不会在调用类的依赖项的上下文中执行。
Path log4j = Paths.get("..../lib/log4j-1.2.17.jar");
Path groovy = Paths.get("..../lib/groovy-all-2.1.3.jar");
RootLoader rootLoader = new RootLoader(new URL[] { log4j.toUri().toURL(), groovy.toUri().toURL() }, null);
GroovyScriptEngine engine = new GroovyScriptEngine(".../src/main/resources", rootLoader);
engine.run("Standalone.groovy", "");
的 Standalone.groovy :
import org.apache.log4j.BasicConfigurator
import org.apache.log4j.Logger
Logger logger = Logger.getLogger(getClass())
BasicConfigurator.configure()
logger.info("hello world")
pom.xml
摘录 :
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-all</artifactId>
<version>2.1.3</version>
</dependency>
我尝试的上述任何变化都会导致
Exception in thread "main" groovy.lang.GroovyRuntimeException: Failed to create Script instance for class: class Standalone. Reason: java.lang.ClassCastException: Standalone cannot be cast to groovy.lang.GroovyObject
at org.codehaus.groovy.runtime.InvokerHelper.createScript(InvokerHelper.java:443)
at groovy.util.GroovyScriptEngine.createScript(GroovyScriptEngine.java:564)
at groovy.util.GroovyScriptEngine.run(GroovyScriptEngine.java:551)
at groovy.util.GroovyScriptEngine.run(GroovyScriptEngine.java:537)
我已将此跟踪回groovy.util.GroovyScriptEngine#loadScriptByName
,其中脚本被解析为Class<T>
,其中T是脚本本身的名称。
我的理论是,这是由于在调用类中运行的groovy运行时与在独立类加载器中运行的groovy运行时之间的二进制不兼容引起的,因为groovy通过反射从脚本创建合成类的方式。
关于如何实现这一目标的任何想法?
答案 0 :(得分:2)
尝试不是直接创建GroovyScriptEngine
,而是通过rootLoader.loadClass()
创建engine.run
并通过反思调用void BitmapToJpg(HBITMAP hbmpImage, int width, int height)
{
time_t now = time(0);
char* dt = ctime(&now);
Bitmap *p_bmp = Bitmap::FromHBITMAP(hbmpImage, NULL);
//Bitmap *p_bmp = new Bitmap(width, height, PixelFormat32bppARGB);
CLSID pngClsid;
int result = GetEncoderClsid(L"image/jpeg", &pngClsid);
if (result != -1)
std::cout << "Encoder succeeded" << std::endl;
else
std::cout << "Encoder failed" << std::endl;
p_bmp->Save(L"screen_.jpg", &pngClsid, NULL);
delete p_bmp;
}
。