java.lang.NullPointerException(空指针异常)是Java编程语言中常见的运行时异常之一。当应用程序尝试在需要对象实例的方法或访问器上调用方法或访问字段,但传入的是null引用时,就会抛出此异常。简单来说,就是当你试图在一个尚未初始化或已被设置为null的对象上执行操作时,就会发生空指针异常。 导致"attempt to read ...
JVMWrapper("JVM_ArrayCopy");// Check if we have null pointersif(src ==NULL|| dst ==NULL) { THROW(vmSymbols::java_lang_NullPointerException()); } arrayOop s = arrayOop(JNIHandles::resolve_non_null(src)); arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst)); assert(oopDesc:...
privatevoidgrow(int minCapacity){// overflow-conscious codeint oldCapacity=elementData.length;int newCapacity=oldCapacity+(oldCapacity>>1);if(newCapacity-minCapacity<0)newCapacity=minCapacity;if(newCapacity-MAX_ARRAY_SIZE>0)newCapacity=hugeCapacity(minCapacity);// minCapacity is usually close to siz...
@OverrideprotectedClassresolveClass(ObjectStreamClass desc)throwsIOException,ClassNotFoundException {if(!desc.getName().equals(Bicycle.class.getName())) {thrownewInvalidClassException("Unauthorized deserialization attempt", desc.getName()); }returnsuper.resolveClass(desc); } 3. 序列化后的流太大 ...
"Unauthorized deserialization attempt", desc.getName()); } return super.resolveClass(desc); } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 通过此方法,可灵活的设置允许反序列化类的白名单,也可设置不允许反序列化类的黑名单。但反序列化漏洞利用...
JsonObject home = array.getJsonObject(0); String number = home.getString("number"); JsonArray instances are list objects that provide read-only access to the values in the JSON array. Any attempt to modify the list, whether directly or using its collection views, results in an UnsupportedOp...
A hint to the scheduler that the current thread is willing to yield its current use of a processor. The scheduler is free to ignore this hint. Yield is a heuristic attempt to improve relative progression between threads that would otherwise over-utilise a CPU. Its use should be combined with...
Unchecked exception thrown when an attempt is made to write to an asynchronous socket channel and a previous write has not completed. C# 复制 [Android.Runtime.Register("java/nio/channels/WritePendingException", ApiSince=26, DoNotGenerateAcw=true)] public class WritePendingException : Java.Lang...
For example, if the embedded Cipher has been initialized for decryption, the CipherInputStream will attempt to decrypt the data it reads from the underlying InputStream before returning them to the application. This class adheres strictly to the semantics, especially the failure semantics, of its...
序列化的数据流以魔术数字和版本号开头,这个值是在调用ObjectOutputStream序列化时,由writeStreamHeader方法写入: protectedvoidwriteStreamHeader()throwsIOException { bout.writeShort(STREAM_MAGIC);//STREAM_MAGIC (2 bytes) 0xACEDbout.writeShort(STREAM_VERSION);//STREAM_VERSION (2 bytes) 5} ...