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I need to convert a bytearray to double. I am using
double dvalue = ByteBuffer.wrap(value).getDouble();
But at the runtime I am getting BufferUnderflowException exception
Exception in thread "main" java.nio.BufferUnderflowException
at java.nio.Buffer.nextGetIndex(Buffer.java:498)
at java.nio.HeapByteBuffer.getDouble(HeapByteBuffer.java:508)
at Myclass.main(Myclass.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.util.RunJar.main(RunJar.java:212)
What do I need to change here?
647
public class BufferUnderflowException extends RuntimeException. Unchecked exception thrown when a relative get operation reaches the source buffer's limit.
ByteBuffer holds a sequence of integer values to be used in an I/O operation. The ByteBuffer class provides the following four categories of operations upon long buffers: Absolute and relative get method that read single bytes. Absolute and relative put methods that write single bytes.
By default, the order of a ByteBuffer object is BIG_ENDIAN. If a byte order is passed as a parameter to the order method, it modifies the byte order of the buffer and returns the buffer itself. The new byte order may be either LITTLE_ENDIAN or BIG_ENDIAN.
ByteBuffer#getDouble() throws
BufferUnderflowException - If there are fewer than eight bytes remaining in this buffer
So value must contain less than 8 bytes. A double is a 64 bit, 8 bytes, data type.
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