我是Java和GWT的新手。我一直在关注构建StockWatcher应用程序（http://code.google.com/webtoolkit/gettingstarted.html）的Google入门教程，并遇到了障碍。该项目运行正常，但当我尝试在调试模式下运行时，我收到“未找到源”错误：
// Compiled from URLClassPath.java (version 1.5 : 49.0, super bit)
public class sun.misc.URLClassPath {
// Field descriptor #27 Ljava/lang/String;
static final java.lang.String USER_AGENT_JAVA_VERSION = "UA-Java-Version";
// Field descriptor #27 Ljava/lang/String;
static final java.lang.String JAVA_VERSION;
// Field descriptor #33 Z
private static final boolean DEBUG;
// Field descriptor #165 Ljava/util/ArrayList;
private java.util.ArrayList path;
// Field descriptor #167 Ljava/util/Stack;
java.util.Stack urls;
// Field descriptor #165 Ljava/util/ArrayList;
java.util.ArrayList loaders;
// Field descriptor #166 Ljava/util/HashMap;
// Signature: Ljava/util/HashMap<Ljava/lang/String;Lsun/misc/URLClassPath$Loader;>;
java.util.HashMap lmap;
// Field descriptor #164 Ljava/net/URLStreamHandler;
private java.net.URLStreamHandler jarHandler;
// Method descriptor #198 ([Ljava/net/URL;Ljava/net/URLStreamHandlerFactory;)V
// Stack: 3, Locals: 4
public URLClassPath(java.net.URL[] arg0, java.net.URLStreamHandlerFactory arg1);
0 aload_0 [this]
1 invokespecial java.lang.Object() [278]
4 aload_0 [this]
5 new java.util.ArrayList [150]
8 dup
9 invokespecial java.util.ArrayList() [299]
12 putfield sun.misc.URLClassPath.path : java.util.ArrayList [272]
15 aload_0 [this]
16 new java.util.Stack [152]
19 dup
20 invokespecial java.util.Stack() [307]
23 putfield sun.misc.URLClassPath.urls : java.util.Stack [274]
26 aload_0 [this]
27 new java.util.ArrayList [150]
30 dup
31 invokespecial java.util.ArrayList() [299]
34 putfield sun.misc.URLClassPath.loaders : java.util.ArrayList [271]
37 aload_0 [this]
38 new java.util.HashMap [151]
41 dup
42 invokespecial java.util.HashMap() [304]
45 putfield sun.misc.URLClassPath.lmap : java.util.HashMap [273]
48 iconst_0
49 istore_3
50 iload_3
51 aload_1 [arg0]
52 arraylength
53 if_icmpge 73
56 aload_0 [this]
57 getfield sun.misc.URLClassPath.path : java.util.ArrayList [272]
60 aload_1 [arg0]
61 iload_3
62 aaload
63 invokevirtual java.util.ArrayList.add(java.lang.Object) : boolean [301]
66 pop
67 iinc 3 1
70 goto 50
73 aload_0 [this]
74 aload_1 [arg0]
75 invokespecial sun.misc.URLClassPath.push(java.net.URL[]) : void [317]
78 aload_2 [arg1]
79 ifnull 94
82 aload_0 [this]
83 aload_2 [arg1]
84 ldc <String "jar"> [4]
86 invokeinterface java.net.URLStreamHandlerFactory.createURLStreamHandler(java.lang.String) : java.net.URLStreamHandler [332] [nargs: 2]
91 putfield sun.misc.URLClassPath.jarHandler : java.net.URLStreamHandler [270]
94 return
Line numbers:
[pc: 0, line: 97]
[pc: 4, line: 73]
[pc: 15, line: 76]
[pc: 26, line: 79]
[pc: 37, line: 82]
[pc: 48, line: 98]
[pc: 56, line: 99]
[pc: 67, line: 98]
[pc: 73, line: 101]
[pc: 78, line: 102]
[pc: 82, line: 103]
[pc: 94, line: 105]
// Method descriptor #178 ([Ljava/net/URL;)V
// Stack: 3, Locals: 2
public URLClassPath(java.net.URL[] arg0);
0 aload_0 [this]
1 aload_1 [arg0]
2 aconst_null
3 invokespecial sun.misc.URLClassPath(java.net.URL[], java.net.URLStreamHandlerFactory) [319]
6 return
Line numbers:
[pc: 0, line: 108]
[pc: 6, line: 109]
// Method descriptor #177 (Ljava/net/URL;)V
// Stack: 3, Locals: 4
public void addURL(java.net.URL arg0);
0 aload_0 [this]
1 getfield sun.misc.URLClassPath.urls : java.util.Stack [274]
4 dup
5 astore_2
6 monitorenter
7 aload_0 [this]
8 getfield sun.misc.URLClassPath.path : java.util.ArrayList [272]
11 aload_1 [arg0]
12 invokevirtual java.util.ArrayList.contains(java.lang.Object) : boolean [302]
15 ifeq 21
18 aload_2
19 monitorexit
20 return
21 aload_0 [this]
22 getfield sun.misc.URLClassPath.urls : java.util.Stack [274]
25 iconst_0
26 aload_1 [arg0]
27 invokevirtual java.util.Stack.add(int, java.lang.Object) : void [310]
30 aload_0 [this]
31 getfield sun.misc.URLClassPath.path : java.util.ArrayList [272]
34 aload_1 [arg0]
35 invokevirtual java.util.ArrayList.add(java.lang.Object) : boolean [301]
38 pop
39 aload_2
40 monitorexit
41 goto 49
44 astore_3
45 aload_2
46 monitorexit
47 aload_3
48 athrow
49 return
Exception Table:
[pc: 7, pc: 20] -> 44 when : any
[pc: 21, pc: 41] -> 44 when : any
[pc: 44, pc: 47] -> 44 when : any
Line numbers:
[pc: 0, line: 116]
[pc: 7, line: 117]
[pc: 18, line: 118]
[pc: 21, line: 120]
[pc: 30, line: 121]
[pc: 39, line: 122]
[pc: 49, line: 123]
// Method descriptor #176 ()[Ljava/net/URL;
// Stack: 2, Locals: 3
public java.net.URL[] getURLs();
0 aload_0 [this]
1 getfield sun.misc.URLClassPath.urls : java.util.Stack [274]
4 dup
5 astore_1
6 monitorenter
7 aload_0 [this]
8 getfield sun.misc.URLClassPath.path : java.util.ArrayList [272]
11 aload_0 [this]
12 getfield sun.misc.URLClassPath.path : java.util.ArrayList [272]
15 invokevirtual java.util.ArrayList.size() : int [298]
18 anewarray java.net.URL [144]
21 invokevirtual java.util.ArrayList.toArray(java.lang.Object[]) : java.lang.Object[] [303]
24 checkcast java.net.URL[] [130]
27 checkcast java.net.URL[] [130]
30 aload_1
31 monitorexit
32 areturn
33 astore_2
34 aload_1
35 monitorexit
36 aload_2
37 athrow
Exception Table:
[pc: 7, pc: 32] -> 33 when : any
[pc: 33, pc: 36] -> 33 when : any
Line numbers:
[pc: 0, line: 129]
[pc: 7, line: 130]
[pc: 33, line: 131]
// Method descriptor #193 (Ljava/lang/String;Z)Ljava/net/URL;
// Stack: 3, Locals: 6
public java.net.URL findResource(java.lang.String arg0, boolean arg1);
0 iconst_0
1 istore 4
3 aload_0 [this]
4 iload 4
6 invokespecial sun.misc.URLClassPath.getLoader(int) : sun.misc.URLClassPath$Loader [318]
9 dup
10 astore_3
11 ifnull 36
14 aload_3
15 aload_1 [arg0]
16 iload_2 [arg1]
17 invokevirtual sun.misc.URLClassPath$Loader.findResource(java.lang.String, boolean) : java.net.URL [327]
20 astore 5
22 aload 5
24 ifnull 30
27 aload 5
29 areturn
30 iinc 4 1
33 goto 3
36 aconst_null
37 areturn
Line numbers:
[pc: 0, line: 145]
[pc: 14, line: 146]
[pc: 22, line: 147]
[pc: 27, line: 148]
[pc: 30, line: 145]
[pc: 36, line: 151]
// Method descriptor #202 (Ljava/lang/String;Z)Lsun/misc/Resource;
// Stack: 3, Locals: 6
public sun.misc.Resource getResource(java.lang.String arg0, boolean arg1);
0 getstatic sun.misc.URLClassPath.DEBUG : boolean [268]
3 ifeq 36
6 getstatic java.lang.System.err : java.io.PrintStream [267]
9 new java.lang.StringBuilder [140]
12 dup
13 invokespecial java.lang.StringBuilder() [283]
16 ldc <String "URLClassPath.getResource(""> [2]
18 invokevirtual java.lang.StringBuilder.append(java.lang.String) : java.lang.StringBuilder [285]
21 aload_1 [arg0]
22 invokevirtual java.lang.StringBuilder.append(java.lang.String) : java.lang.StringBuilder [285]
25 ldc <String "")"> [1]
27 invokevirtual java.lang.StringBuilder.append(java.lang.String) : java.lang.StringBuilder [285]
30 invokevirtual java.lang.StringBuilder.toString() : java.lang.String [284]
33 invokevirtual java.io.PrintStream.println(java.lang.String) : void [277]
36 iconst_0
37 istore 4
39 aload_0 [this]
40 iload 4
42 invokespecial sun.misc.URLClassPath.getLoader(int) : sun.misc.URLClassPath$Loader [318]
45 dup
46 astore_3
47 ifnull 72
50 aload_3
51 aload_1 [arg0]
52 iload_2 [arg1]
53 invokevirtual sun.misc.URLClassPath$Loader.getResource(java.lang.String, boolean) : sun.misc.Resource [328]
56 astore 5
58 aload 5
60 ifnull 66
63 aload 5
65 areturn
66 iinc 4 1
69 goto 39
72 aconst_null
73 areturn
Line numbers:
[pc: 0, line: 163]
[pc: 6, line: 164]
[pc: 36, line: 168]
[pc: 50, line: 169]
[pc: 58, line: 170]
[pc: 63, line: 171]
[pc: 66, line: 168]
[pc: 72, line: 174]
// Method descriptor #200 (Ljava/lang/String;Z)Ljava/util/Enumeration;
// Stack: 5, Locals: 3
public java.util.Enumeration findResources(java.lang.String arg0, boolean arg1);
0 new sun.misc.URLClassPath$1 [155]
3 dup
4 aload_0 [this]
5 aload_1 [arg0]
6 iload_2 [arg1]
7 invokespecial sun.misc.URLClassPath$1(sun.misc.URLClassPath, java.lang.String, boolean) [323]
10 areturn
Line numbers:
[pc: 0, line: 186]
// Method descriptor #201 (Ljava/lang/String;)Lsun/misc/Resource;
// Stack: 3, Locals: 2
public sun.misc.Resource getResource(java.lang.String arg0);
0 aload_0 [this]
1 aload_1 [arg0]
2 iconst_1
3 invokevirtual sun.misc.URLClassPath.getResource(java.lang.String, boolean) : sun.misc.Resource [321]
6 areturn
Line numbers:
[pc: 0, line: 221]
// Method descriptor #200 (Ljava/lang/String;Z)Ljava/util/Enumeration;
// Stack: 5, Locals: 3
public java.util.Enumeration getResources(java.lang.String arg0, boolean arg1);
0 new sun.misc.URLClassPath$2 [156]
3 dup
4 aload_0 [this]
5 aload_1 [arg0]
6 iload_2 [arg1]
7 invokespecial sun.misc.URLClassPath$2(sun.misc.URLClassPath, java.lang.String, boolean) [324]
10 areturn
Line numbers:
[pc: 0, line: 233]
// Method descriptor #199 (Ljava/lang/String;)Ljava/util/Enumeration;
// Stack: 3, Locals: 2
public java.util.Enumeration getResources(java.lang.String arg0);
0 aload_0 [this]
1 aload_1 [arg0]
2 iconst_1
3 invokevirtual sun.misc.URLClassPath.getResources(java.lang.String, boolean) : java.util.Enumeration [320]
6 areturn
Line numbers:
[pc: 0, line: 268]
// Method descriptor #182 (I)Lsun/misc/URLClassPath$Loader;
// Stack: 3, Locals: 6
private synchronized sun.misc.URLClassPath.Loader getLoader(int arg0);
0 aload_0 [this]
1 getfield sun.misc.URLClassPath.loaders : java.util.ArrayList [271]
4 invokevirtual java.util.ArrayList.size() : int [298]
7 iload_1 [arg0]
8 iconst_1
9 iadd
10 if_icmpge 133
13 aload_0 [this]
14 getfield sun.misc.URLClassPath.urls : java.util.Stack [274]
17 dup
18 astore_3
19 monitorenter
20 aload_0 [this]
21 getfield sun.misc.URLClassPath.urls : java.util.Stack [274]
24 invokevirtual java.util.Stack.empty() : boolean [308]
27 ifeq 34
30 aconst_null
31 aload_3
32 monitorexit
33 areturn
34 aload_0 [this]
35 getfield sun.misc.URLClassPath.urls : java.util.Stack [274]
38 invokevirtual java.util.Stack.pop() : java.lang.Object [309]
41 checkcast java.net.URL [144]
44 astore_2
45 aload_3
46 monitorexit
47 goto 57
50 astore 4
52 aload_3
53 monitorexit
54 aload 4
56 athrow
57 aload_2
58 invokestatic sun.net.util.URLUtil.urlNoFragString(java.net.URL) : java.lang.String [329]
61 astore_3
62 aload_0 [this]
63 getfield sun.misc.URLClassPath.lmap : java.util.HashMap [273]
66 aload_3
67 invokevirtual java.util.HashMap.containsKey(java.lang.Object) : boolean [305]
70 ifeq 76
73 goto 0
76 aload_0 [this]
77 aload_2
78 invokespecial sun.misc.URLClassPath.getLoader(java.net.URL) : sun.misc.URLClassPath$Loader [322]
81 astore 4
83 aload 4
85 invokevirtual sun.misc.URLClassPath$Loader.getClassPath() : java.net.URL[] [326]
88 astore 5
90 aload 5
92 ifnull 101
95 aload_0 [this]
96 aload 5
98 invokespecial sun.misc.URLClassPath.push(java.net.URL[]) : void [317]
101 goto 109
104 astore 5
106 goto 0
109 aload_0 [this]
110 getfield sun.misc.URLClassPath.loaders : java.util.ArrayList [271]
113 aload 4
115 invokevirtual java.util.ArrayList.add(java.lang.Object) : boolean [301]
118 pop
119 aload_0 [this]
120 getfield sun.misc.URLClassPath.lmap : java.util.HashMap [273]
123 aload_3
124 aload 4
126 invokevirtual java.util.HashMap.put(java.lang.Object, java.lang.Object) : java.lang.Object [306]
129 pop
130 goto 0
133 aload_0 [this]
134 getfield sun.misc.URLClassPath.loaders : java.util.ArrayList [271]
137 iload_1 [arg0]
138 invokevirtual java.util.ArrayList.get(int) : java.lang.Object [300]
141 checkcast sun.misc.URLClassPath$Loader [160]
144 areturn
Exception Table:
[pc: 20, pc: 33] -> 50 when : any
[pc: 34, pc: 47] -> 50 when : any
[pc: 50, pc: 54] -> 50 when : any
[pc: 76, pc: 101] -> 104 when : java.io.IOException
Line numbers:
[pc: 0, line: 279]
[pc: 13, line: 282]
[pc: 20, line: 283]
[pc: 30, line: 284]
[pc: 34, line: 286]
[pc: 45, line: 288]
[pc: 57, line: 292]
[pc: 62, line: 293]
[pc: 73, line: 294]
[pc: 76, line: 299]
[pc: 83, line: 302]
[pc: 90, line: 303]
[pc: 95, line: 304]
[pc: 101, line: 309]
[pc: 104, line: 306]
[pc: 106, line: 308]
[pc: 109, line: 311]
[pc: 119, line: 312]
[pc: 130, line: 313]
[pc: 133, line: 314]
// Method descriptor #203 (Ljava/net/URL;)Lsun/misc/URLClassPath$Loader;
// Stack: 4, Locals: 3
private sun.misc.URLClassPath.Loader getLoader(java.net.URL arg0) throws java.io.IOException;
0 new sun.misc.URLClassPath$3 [157]
3 dup
4 aload_0 [this]
5 aload_1 [arg0]
6 invokespecial sun.misc.URLClassPath$3(sun.misc.URLClassPath, java.net.URL) [325]
9 invokestatic java.security.AccessController.doPrivileged(java.security.PrivilegedExceptionAction) : java.lang.Object [294]
12 checkcast sun.misc.URLClassPath$Loader [160]
15 areturn
16 astore_2
17 aload_2
18 invokevirtual java.security.PrivilegedActionException.getException() : java.lang.Exception [297]
21 checkcast java.io.IOException [133]
24 athrow
Exception Table:
[pc: 0, pc: 15] -> 16 when : java.security.PrivilegedActionException
Line numbers:
[pc: 0, line: 322]
[pc: 16, line: 337]
[pc: 17, line: 338]
// Method descriptor #178 ([Ljava/net/URL;)V
// Stack: 3, Locals: 5
private void push(java.net.URL[] arg0);
0 aload_0 [this]
1 getfield sun.misc.URLClassPath.urls : java.util.Stack [274]
4 dup
5 astore_2
6 monitorenter
7 aload_1 [arg0]
8 arraylength
9 iconst_1
10 isub
11 istore_3
12 iload_3
13 iflt 33
16 aload_0 [this]
17 getfield sun.misc.URLClassPath.urls : java.util.Stack [274]
20 aload_1 [arg0]
21 iload_3
22 aaload
23 invokevirtual java.util.Stack.push(java.lang.Object) : java.lang.Object [311]
26 pop
27 iinc 3 -1
30 goto 12
33 aload_2
34 monitorexit
35 goto 45
38 astore 4
40 aload_2
41 monitorexit
42 aload 4
44 athrow
45 return
Exception Table:
[pc: 7, pc: 35] -> 38 when : any
[pc: 38, pc: 42] -> 38 when : any
Line numbers:
[pc: 0, line: 346]
[pc: 7, line: 347]
[pc: 16, line: 348]
[pc: 27, line: 347]
[pc: 33, line: 350]
[pc: 45, line: 351]
// Method descriptor #192 (Ljava/lang/String;)[Ljava/net/URL;
// Stack: 5, Locals: 6
public static java.net.URL[] pathToURLs(java.lang.String arg0);
0 new java.util.StringTokenizer [153]
3 dup
4 aload_0 [arg0]
5 getstatic java.io.File.pathSeparator : java.lang.String [266]
8 invokespecial java.util.StringTokenizer(java.lang.String, java.lang.String) [315]
11 astore_1
12 aload_1
13 invokevirtual java.util.StringTokenizer.countTokens() : int [312]
16 anewarray java.net.URL [144]
19 astore_2
20 iconst_0
21 istore_3
22 aload_1
23 invokevirtual java.util.StringTokenizer.hasMoreTokens() : boolean [313]
26 ifeq 80
29 new java.io.File [131]
32 dup
33 aload_1
34 invokevirtual java.util.StringTokenizer.nextToken() : java.lang.String [314]
37 invokespecial java.io.File(java.lang.String) [276]
40 astore 4
42 new java.io.File [131]
45 dup
46 aload 4
48 invokevirtual java.io.File.getCanonicalPath() : java.lang.String [275]
51 invokespecial java.io.File(java.lang.String) [276]
54 astore 4
56 goto 61
59 astore 5
61 aload_2
62 iload_3
63 iinc 3 1
66 aload 4
68 invokestatic sun.net.www.ParseUtil.fileToEncodedURL(java.io.File) : java.net.URL [330]
71 aastore
72 goto 77
75 astore 5
77 goto 22
80 aload_2
81 arraylength
82 iload_3
83 if_icmpeq 104
86 iload_3
87 anewarray java.net.URL [144]
90 astore 4
92 aload_2
93 iconst_0
94 aload 4
96 iconst_0
97 iload_3
98 invokestatic java.lang.System.arraycopy(java.lang.Object, int, java.lang.Object, int, int) : void [287]
101 aload 4
103 astore_2
104 aload_2
105 areturn
Exception Table:
[pc: 42, pc: 56] -> 59 when : java.io.IOException
[pc: 61, pc: 72] -> 75 when : java.io.IOException
Line numbers:
[pc: 0, line: 360]
[pc: 12, line: 361]
[pc: 20, line: 362]
[pc: 22, line: 363]
[pc: 29, line: 364]
[pc: 42, line: 366]
[pc: 56, line: 369]
[pc: 59, line: 367]
[pc: 61, line: 371]
[pc: 72, line: 372]
[pc: 77, line: 373]
[pc: 80, line: 375]
[pc: 86, line: 376]
[pc: 92, line: 377]
[pc: 101, line: 378]
[pc: 104, line: 380]
// Method descriptor #194 (Ljava/net/URL;)Ljava/net/URL;
// Stack: 1, Locals: 3
public java.net.URL checkURL(java.net.URL arg0);
0 aload_1 [arg0]
1 invokestatic sun.misc.URLClassPath.check(java.net.URL) : void [316]
4 goto 10
7 astore_2
8 aconst_null
9 areturn
10 aload_1 [arg0]
11 areturn
Exception Table:
[pc: 0, pc: 4] -> 7 when : java.lang.Exception
Line numbers:
[pc: 0, line: 390]
[pc: 4, line: 393]
[pc: 7, line: 391]
[pc: 8, line: 392]
[pc: 10, line: 395]
// Method descriptor #177 (Ljava/net/URL;)V
// Stack: 3, Locals: 6
static void check(java.net.URL arg0) throws java.io.IOException;
0 invokestatic java.lang.System.getSecurityManager() : java.lang.SecurityManager [286]
3 astore_1
4 aload_1
5 ifnull 122
8 aload_0 [arg0]
9 invokevirtual java.net.URL.openConnection() : java.net.URLConnection [291]
12 astore_2
13 aload_2
14 invokevirtual java.net.URLConnection.getPermission() : java.security.Permission [292]
17 astore_3
18 aload_3
19 ifnull 122
22 aload_1
23 aload_3
24 invokevirtual java.lang.SecurityManager.checkPermission(java.security.Permission) : void [281]
27 goto 122
30 astore 4
32 aload_3
33 instanceof java.io.FilePermission [132]
36 ifeq 63
39 aload_3
40 invokevirtual java.security.Permission.getActions() : java.lang.String [295]
43 ldc <String "read"> [6]
45 invokevirtual java.lang.String.indexOf(java.lang.String) : int [282]
48 iconst_m1
49 if_icmpeq 63
52 aload_1
53 aload_3
54 invokevirtual java.security.Permission.getName() : java.lang.String [296]
57 invokevirtual java.lang.SecurityManager.checkRead(java.lang.String) : void [279]
60 goto 122
63 aload_3
64 instanceof java.net.SocketPermission [143]
67 ifeq 119
70 aload_3
71 invokevirtual java.security.Permission.getActions() : java.lang.String [295]
74 ldc <String "connect"> [3]
76 invokevirtual java.lang.String.indexOf(java.lang.String) : int [282]
79 iconst_m1
80 if_icmpeq 119
83 aload_0 [arg0]
84 astore 5
86 aload_2
87 instanceof java.net.JarURLConnection [142]
90 ifeq 102
93 aload_2
94 checkcast java.net.JarURLConnection [142]
97 invokevirtual java.net.JarURLConnection.getJarFileURL() : java.net.URL [288]
100 astore 5
102 aload_1
103 aload 5
105 invokevirtual java.net.URL.getHost() : java.lang.String [290]
108 aload 5
110 invokevirtual java.net.URL.getPort() : int [289]
113 invokevirtual java.lang.SecurityManager.checkConnect(java.lang.String, int) : void [280]
116 goto 122
119 aload 4
121 athrow
122 return
Exception Table:
[pc: 22, pc: 27] -> 30 when : java.lang.SecurityException
Line numbers:
[pc: 0, line: 404]
[pc: 4, line: 405]
[pc: 8, line: 406]
[pc: 13, line: 407]
[pc: 18, line: 408]
[pc: 22, line: 410]
[pc: 27, line: 429]
[pc: 30, line: 411]
[pc: 32, line: 414]
[pc: 52, line: 416]
[pc: 63, line: 417]
[pc: 83, line: 420]
[pc: 86, line: 421]
[pc: 93, line: 422]
[pc: 102, line: 424]
[pc: 116, line: 426]
[pc: 119, line: 427]
[pc: 122, line: 432]
// Method descriptor #204 (Lsun/misc/URLClassPath;I)Lsun/misc/URLClassPath$Loader;
// Stack: 2, Locals: 2
static synthetic sun.misc.URLClassPath.Loader access$000(sun.misc.URLClassPath arg0, int arg1);
0 aload_0 [arg0]
1 iload_1 [arg1]
2 invokespecial sun.misc.URLClassPath.getLoader(int) : sun.misc.URLClassPath$Loader [318]
5 areturn
Line numbers:
[pc: 0, line: 60]
// Method descriptor #197 (Lsun/misc/URLClassPath;)Ljava/net/URLStreamHandler;
// Stack: 1, Locals: 1
static synthetic java.net.URLStreamHandler access$100(sun.misc.URLClassPath arg0);
0 aload_0 [arg0]
1 getfield sun.misc.URLClassPath.jarHandler : java.net.URLStreamHandler [270]
4 areturn
Line numbers:
[pc: 0, line: 60]
// Method descriptor #12 ()Z
// Stack: 1, Locals: 0
static synthetic boolean access$300();
0 getstatic sun.misc.URLClassPath.DEBUG : boolean [268]
3 ireturn
Line numbers:
[pc: 0, line: 60]
// Method descriptor #11 ()V
// Stack: 3, Locals: 0
static {};
0 new sun.security.action.GetPropertyAction [163]
3 dup
4 ldc <String "java.version"> [5]
6 invokespecial sun.security.action.GetPropertyAction(java.lang.String) [331]
9 invokestatic java.security.AccessController.doPrivileged(java.security.PrivilegedAction) : java.lang.Object [293]
12 checkcast java.lang.String [139]
15 putstatic sun.misc.URLClassPath.JAVA_VERSION : java.lang.String [269]
18 new sun.security.action.GetPropertyAction [163]
21 dup
22 ldc <String "sun.misc.URLClassPath.debug"> [7]
24 invokespecial sun.security.action.GetPropertyAction(java.lang.String) [331]
27 invokestatic java.security.AccessController.doPrivileged(java.security.PrivilegedAction) : java.lang.Object [293]
30 ifnull 37
33 iconst_1
34 goto 38
37 iconst_0
38 putstatic sun.misc.URLClassPath.DEBUG : boolean [268]
41 return
Line numbers:
[pc: 0, line: 66]
[pc: 18, line: 68]
[pc: 41, line: 70]
Inner classes:
[inner class info: #155 sun/misc/URLClassPath$1, outer class info: #0
inner name: #0, accessflags: 0 default],
[inner class info: #156 sun/misc/URLClassPath$2, outer class info: #0
inner name: #0, accessflags: 0 default],
[inner class info: #157 sun/misc/URLClassPath$3, outer class info: #0
inner name: #0, accessflags: 0 default],
[inner class info: #158 sun/misc/URLClassPath$FileLoader, outer class info: #154 sun/misc/URLClassPath
inner name: #333 FileLoader, accessflags: 10 private static],
[inner class info: #159 sun/misc/URLClassPath$JarLoader, outer class info: #154 sun/misc/URLClassPath
inner name: #334 JarLoader, accessflags: 8 static],
[inner class info: #160 sun/misc/URLClassPath$Loader, outer class info: #154 sun/misc/URLClassPath
inner name: #335 Loader, accessflags: 10 private static]
}
我认为这可能是编译器和JDK之间的问题。我试图调整设置，但到目前为止还没有解决问题。如果我需要提供更多信息，请告诉我。
答案 0 :(得分：0)
在定位GWT时，您需要特别注意不访问或提及您在GWT模块中没有准备好源代码的类。这是由于GWT的工作方式 - 它编译为Javascript而不是类文件，而是Java源代码 - 它还可以完成整个程序优化，这意味着所有类可以在您的程序中使用被编译成JS（也意味着动态类加载是不可能的）。
你在这里展示的是与sun.misc.URLClassPath对应的类文件的反汇编，它对GWT程序和鱼的自行车一样有用。首先，GWT没有ClassPath的概念，因为GWT模块中使用的所有代码都是编译器已知的。其次，它位于sun.misc包中，您几乎肯定没有源代码。
鉴于错误消息的最后一点是可以理解的，但是这个引用表明你要么误解了GWT，要么你从f.e复制了代码。小程序。
要解决此错误，请不要引用该类。
答案 1 :(得分：0)
你的eclipse类路径中有两个GWT jar。