Java Nashorn TypeError:无法在<;中调用未定义;评估>;
当运行下面的代码时,我得到了一个错误。我不知道是什么导致了这个错误Java Nashorn TypeError:无法在<;中调用未定义;评估>;,java,javascript,typeerror,nashorn,Java,Javascript,Typeerror,Nashorn,当运行下面的代码时,我得到了一个错误。我不知道是什么导致了这个错误 ScriptEngine engine = engineManager.getEngineByName("nashorn"); String str = "var shape_objects = [ Java.Type(\"new Triangle()\"), Java.Type(\"new Circle()\"), Java.Type(\"new Rectangle()\"), Java.Type(\"new Sh
ScriptEngine engine = engineManager.getEngineByName("nashorn");
String str = "var shape_objects = [ Java.Type(\"new Triangle()\"), Java.Type(\"new Circle()\"), Java.Type(\"new Rectangle()\"), Java.Type(\"new Shape()\")];"+
"var colors = [\"Red\", \"Green\", \"Blue\", \"Abstract\"];"+
"var j = 0;"+
"for(var i in shape_objects) {"+
" shape_objects[i].setColor(colors[j]);"+
" j = j+1;"+
"}"+
"for(var k in shape_objects) {"+
" print(shape_objects[k].getColor());"+
"}";
engine.eval(str);
// Class definition for other Shape classes is similar
public class Circle {
private String color;
public String setColor(String color) {
this.color = new String(color);
System.out.println("Color of Circle is set to : " + this.color);
return this.color;
}
public String getColor() {
return color;
}
}
错误说明:
Exception in thread "main" javax.script.ScriptException: TypeError:
Cannot call undefined in <eval> at line number 1
at jdk.nashorn.api.scripting.NashornScriptEngine.throwAsScriptException(NashornScriptEngine.java:455)
at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:439)
at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:401)
at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:397)
at jdk.nashorn.api.scripting.NashornScriptEngine.eval(NashornScriptEngine.java:152)
at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)
at nashorntest.Test.main(Test.java:40)
Caused by: <eval>:1 TypeError: Cannot call undefined
at jdk.nashorn.internal.runtime.ECMAErrors.error(ECMAErrors.java:57)
at jdk.nashorn.internal.runtime.ECMAErrors.typeError(ECMAErrors.java:213)
at jdk.nashorn.internal.runtime.ECMAErrors.typeError(ECMAErrors.java:185)
at jdk.nashorn.internal.runtime.ECMAErrors.typeError(ECMAErrors.java:172)
at jdk.nashorn.internal.runtime.Undefined.lookupTypeError(Undefined.java:128)
at jdk.nashorn.internal.runtime.Undefined.lookup(Undefined.java:100)
at jdk.nashorn.internal.runtime.linker.NashornLinker.getGuardedInvocation(NashornLinker.java:102)
at jdk.nashorn.internal.runtime.linker.NashornLinker.getGuardedInvocation(NashornLinker.java:94)
at jdk.internal.dynalink.support.CompositeTypeBasedGuardingDynamicLinker.getGuardedInvocation(CompositeTypeBasedGuardingDynamicLinker.java:176)
at jdk.internal.dynalink.support.CompositeGuardingDynamicLinker.getGuardedInvocation(CompositeGuardingDynamicLinker.java:124)
at jdk.internal.dynalink.support.LinkerServicesImpl.getGuardedInvocation(LinkerServicesImpl.java:149)
at jdk.internal.dynalink.DynamicLinker.relink(DynamicLinker.java:233)
at jdk.nashorn.internal.scripts.Script$\^eval\_.:program(<eval>:1)
at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:636)
at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:229)
线程“main”javax.script.ScriptException中的异常:TypeError:
无法在第1行调用未定义的in
位于jdk.nashorn.api.scripting.NashornScriptEngine.throwAsScriptException(NashornScriptEngine.java:455)
位于jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:439)
位于jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:401)
位于jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:397)
位于jdk.nashorn.api.scripting.NashornScriptEngine.eval(NashornScriptEngine.java:152)
位于javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)
位于nashortest.Test.main(Test.java:40)
由::1引起的TypeError:无法调用undefined
位于jdk.nashorn.internal.runtime.ECMAErrors.error(ECMAErrors.java:57)
位于jdk.nashorn.internal.runtime.ECMAErrors.typeError(ECMAErrors.java:213)
位于jdk.nashorn.internal.runtime.ECMAErrors.typeError(ECMAErrors.java:185)
位于jdk.nashorn.internal.runtime.ECMAErrors.typeError(ECMAErrors.java:172)
在jdk.nashorn.internal.runtime.Undefined.lookupTypeError(Undefined.java:128)中
位于jdk.nashorn.internal.runtime.Undefined.lookup(Undefined.java:100)
位于jdk.nashorn.internal.runtime.linker.NashornLinker.getGuardInvocation(NashornLinker.java:102)
位于jdk.nashorn.internal.runtime.linker.NashornLinker.getGuardInvocation(NashornLinker.java:94)
位于jdk.internal.dynalink.support.CompositeTypebasedGuardingDynamicScalt.getGuardedInvocation(CompositeTypebasedGuardingDynamicScalt.java:176)
位于jdk.internal.dynalink.support.compositeguardingdynamicsold.getGuardedInvocation(compositeguardingdynamicsold.java:124)
位于jdk.internal.dynalink.support.LinkerServiceSiml.GetGuardInvocation(LinkerServiceSiml.java:149)
位于jdk.internal.dynalink.dynamicsold.relink(dynamicsold.java:233)
在jdk.nashorn.internal.scripts.Script$^eval\:程序(:1)
位于jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:636)
位于jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:229)
回溯包含Nashorn
eval
方法,这意味着它在运行嵌入式JavaScript时遇到未经处理的错误
我认为这可能发生在脚本的第一行:用于实例化Java对象的方法可能不存在于脚本中使用的名称下
这个函数的作用是使用完全限定的Java类名调用Java.type
,然后调用返回的函数从JavaScript实例化一个类。尝试在较小的脚本中创建一个圆圈,如下所示:
var Circle = Java.type("mypackage.Circle");
var myCircle = new Circle();
// ...
从那里开始建设;确保用此代码的实际包名替换
mypackage
。找到了解决方案。与使用双引号不同,Java.Type(\“new Triangle()\”
应该使用单引号:Java.Type(\'new Triangle()\”
。同样,对于所有其他类型也是如此。