(keep in mind that JNI methods get a JNIEnv *, not a direct JNIEnv)
given JNIEnv x, you can write ((void**)x)[N] to access a function pointer, where N is:
4 GetVersion
5 DefineClass
6 FindClass
7 FromReflectedMethod
8 FromReflectedField
9 ToReflectedMethod
10 GetSuperclass
11 IsAssignableFrom
12 ToReflectedField
13 Throw
14 ThrowNew
15 ExceptionOccurred
16 ExceptionDescribe
17 ExceptionClear
18 FatalError
19 PushLocalFrame
20 PopLocalFrame
21 NewGlobalRef
22 DeleteGlobalRef
23 DeleteLocalRef
24 IsSameObject
25 NewLocalRef
26 EnsureLocalCapacity
27 AllocObject
28 NewObject
29 NewObjectV
30 NewObjectA
31 GetObjectClass
32 IsInstanceOf
33 GetMethodID
34 CallObjectMethod
35 CallObjectMethodV
36 CallObjectMethodA
37 CallBooleanMethod
38 CallBooleanMethodV
39 CallBooleanMethodA
40 CallByteMethod
41 CallByteMethodV
42 CallByteMethodA
43 CallCharMethod
44 CallCharMethodV
45 CallCharMethodA
46 CallShortMethod
47 CallShortMethodV
48 CallShortMethodA
49 CallIntMethod
50 CallIntMethodV
51 CallIntMethodA
52 CallLongMethod
53 CallLongMethodV
54 CallLongMethodA
55 CallFloatMethod
56 CallFloatMethodV
57 CallFloatMethodA
58 CallDoubleMethod
59 CallDoubleMethodV
60 CallDoubleMethodA
61 CallVoidMethod
62 CallVoidMethodV
63 CallVoidMethodA
64 CallNonvirtualObjectMethod
65 CallNonvirtualObjectMethodV
66 CallNonvirtualObjectMethodA
67 CallNonvirtualBooleanMethod
68 CallNonvirtualBooleanMethodV
69 CallNonvirtualBooleanMethodA
70 CallNonvirtualByteMethod
71 CallNonvirtualByteMethodV
72 CallNonvirtualByteMethodA
73 CallNonvirtualCharMethod
74 CallNonvirtualCharMethodV
75 CallNonvirtualCharMethodA
76 CallNonvirtualShortMethod
77 CallNonvirtualShortMethodV
78 CallNonvirtualShortMethodA
79 CallNonvirtualIntMethod
80 CallNonvirtualIntMethodV
81 CallNonvirtualIntMethodA
82 CallNonvirtualLongMethod
83 CallNonvirtualLongMethodV
84 CallNonvirtualLongMethodA
85 CallNonvirtualFloatMethod
86 CallNonvirtualFloatMethodV
87 CallNonvirtualFloatMethodA
88 CallNonvirtualDoubleMethod
89 CallNonvirtualDoubleMethodV
90 CallNonvirtualDoubleMethodA
91 CallNonvirtualVoidMethod
92 CallNonvirtualVoidMethodV
93 CallNonvirtualVoidMethodA
94 GetFieldID
95 GetObjectField
96 GetBooleanField
97 GetByteField
98 GetCharField
99 GetShortField
100 GetIntField
101 GetLongField
102 GetFloatField
103 GetDoubleField
104 SetObjectField
105 SetBooleanField
106 SetByteField
107 SetCharField
108 SetShortField
109 SetIntField
110 SetLongField
111 SetFloatField
112 SetDoubleField
113 GetStaticMethodID
114 CallStaticObjectMethod
115 CallStaticObjectMethodV
116 CallStaticObjectMethodA
117 CallStaticBooleanMethod
118 CallStaticBooleanMethodV
119 CallStaticBooleanMethodA
120 CallStaticByteMethod
121 CallStaticByteMethodV
122 CallStaticByteMethodA
123 CallStaticCharMethod
124 CallStaticCharMethodV
125 CallStaticCharMethodA
126 CallStaticShortMethod
127 CallStaticShortMethodV
128 CallStaticShortMethodA
129 CallStaticIntMethod
130 CallStaticIntMethodV
131 CallStaticIntMethodA
132 CallStaticLongMethod
133 CallStaticLongMethodV
134 CallStaticLongMethodA
135 CallStaticFloatMethod
136 CallStaticFloatMethodV
137 CallStaticFloatMethodA
138 CallStaticDoubleMethod
139 CallStaticDoubleMethodV
140 CallStaticDoubleMethodA
141 CallStaticVoidMethod
142 CallStaticVoidMethodV
143 CallStaticVoidMethodA
144 GetStaticFieldID
145 GetStaticObjectField
146 GetStaticBooleanField
147 GetStaticByteField
148 GetStaticCharField
149 GetStaticShortField
150 GetStaticIntField
151 GetStaticLongField
152 GetStaticFloatField
153 GetStaticDoubleField
154 SetStaticObjectField
155 SetStaticBooleanField
156 SetStaticByteField
157 SetStaticCharField
158 SetStaticShortField
159 SetStaticIntField
160 SetStaticLongField
161 SetStaticFloatField
162 SetStaticDoubleField
163 NewString
164 GetStringLength
165 GetStringChars
166 ReleaseStringChars
167 NewStringUTF
168 GetStringUTFLength
169 GetStringUTFChars
170 ReleaseStringUTFChars
171 GetArrayLength
172 NewObjectArray
173 GetObjectArrayElement
174 SetObjectArrayElement
175 NewBooleanArray
176 NewByteArray
177 NewCharArray
178 NewShortArray
179 NewIntArray
180 NewLongArray
181 NewFloatArray
182 NewDoubleArray
183 GetBooleanArrayElements
184 GetByteArrayElements
185 GetCharArrayElements
186 GetShortArrayElements
187 GetIntArrayElements
188 GetLongArrayElements
189 GetFloatArrayElements
190 GetDoubleArrayElements
191 ReleaseBooleanArrayElements
192 ReleaseByteArrayElements
193 ReleaseCharArrayElements
194 ReleaseShortArrayElements
195 ReleaseIntArrayElements
196 ReleaseLongArrayElements
197 ReleaseFloatArrayElements
198 ReleaseDoubleArrayElements
199 GetBooleanArrayRegion
200 GetByteArrayRegion
201 GetCharArrayRegion
202 GetShortArrayRegion
203 GetIntArrayRegion
204 GetLongArrayRegion
205 GetFloatArrayRegion
206 GetDoubleArrayRegion
207 SetBooleanArrayRegion
208 SetByteArrayRegion
209 SetCharArrayRegion
210 SetShortArrayRegion
211 SetIntArrayRegion
212 SetLongArrayRegion
213 SetFloatArrayRegion
214 SetDoubleArrayRegion
215 RegisterNatives
216 UnregisterNatives
217 MonitorEnter
218 MonitorExit
219 GetJavaVM
220 GetStringRegion
221 GetStringUTFRegion
222 GetPrimitiveArrayCritical
223 ReleasePrimitiveArrayCritical
224 GetStringCritical
225 ReleaseStringCritical
226 NewWeakGlobalRef
227 DeleteWeakGlobalRef
228 ExceptionCheck
229 NewDirectByteBuffer
230 GetDirectBufferAddress
231 GetDirectBufferCapacity
232 GetObjectRefType
233 GetModule
234 IsVirtualThread
this should be implementation- and arch-independent. source: