I am trying to use the JTape Library to read some data from a DDS4 magnetic tape. I want to use eclipse to run my code under Linux 12.04 LTS
The problem is that I cannot let eclipse reference the TapeLinux.c Library in any way.
PROBLEM:
Exception in thread "main" java.lang.UnsatisfiedLinkError: no TapeLinux in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1886)
at java.lang.Runtime.loadLibrary0(Runtime.java:849)
at java.lang.System.loadLibrary(System.java:1088)
at BasicTapeDevice.<clinit>(BasicTapeDevice.java:169)
at TestEOD.main(TestEOD.java:12)
This are my classes:
/* TestEOD.java */
import java.io.*;
public class TestEOD {
public static void main(String[] args) throws IOException {
/* if (args.length != 1) {
System.err.println("Usage: java TestEOD <path to device>");
System.exit(1);
}*/
BasicTapeDevice d = new BasicTapeDevice("/dev/nst0");
System.out.print("Rewinding...");
System.out.flush();
d.rewind();
System.out.println("done!");
System.out.print("Spacing to end of data...");
System.out.flush();
d.spaceEOD();
System.out.println("done!");
}
}
/* BasicTapeDevice.java */
import java.io.*;
public class BasicTapeDevice {
private FileDescriptor fd;
private InputStream in;
private OutputStream out;
private boolean eof;
private boolean eom;
private boolean ignoreEOM;
public BasicTapeDevice(String pathName) throws IOException {
fd = new FileDescriptor();
tapeOpen(pathName);
in = new TapeInputStream();
out = new TapeOutputStream();
eof = false;
eom = false;
ignoreEOM = false;
}
public synchronized void close() throws IOException {
if (fd != null) {
try {
if (fd.valid()) {
tapeClose();
}
} finally {
fd = null;
}
}
}
public InputStream getInputStream() throws IOException {
ensureOpen();
return in;
}
public OutputStream getOutputStream() throws IOException {
ensureOpen();
return out;
}
public int getBlockSize() throws IOException {
ensureOpen();
return tapeGetBlockSize();
}
public void setBlockSize(int bs) throws IOException {
ensureOpen();
tapeSetBlockSize(bs);
}
public void rewind() throws IOException {
ensureOpen();
tapeRewind();
}
public void spaceEOD() throws IOException {
ensureOpen();
tapeSpaceEOD();
}
public void clearEOF() throws IOException {
ensureOpen();
if (eof) {
eof = false;
/* assume that the file mark has already been skipped */
} else {
throw new IOException("not at end of file");
}
}
public void clearEOM() throws IOException {
ensureOpen();
if (eom) {
ignoreEOM = true;
} else {
throw new IOException("not at logical end of media");
}
}
class TapeInputStream extends InputStream {
private byte[] temp = new byte[1];
public int read() throws IOException {
int n = read(temp, 0, 1);
if (n <= 0) {
return -1;
}
return temp[0] & 0xff;
}
public int read(byte[] b, int off, int len) throws IOException {
if (b == null) {
throw new NullPointerException();
}
if (off < 0 || len < 0 || off+len > b.length) {
throw new IndexOutOfBoundsException();
}
if (len == 0) {
return 0;
}
if (eof) {
return -1;
}
ensureOpen();
int n = tapeRead(b, off, len);
if (n <= 0) {
return -1;
}
return n;
}
public long skip(long numbytes) throws IOException {
return 0;
}
public void close() throws IOException {
BasicTapeDevice.this.close();
}
}
class TapeOutputStream extends OutputStream {
private byte[] temp = new byte[1];
public void write(int b) throws IOException {
temp[0] = (byte) b;
write(temp, 0, 1);
}
public void write(byte[] b) throws IOException {
write(b, 0, b.length);
}
public void write(byte[] b, int off, int len) throws IOException {
if (b == null) {
throw new NullPointerException();
}
if (off < 0 || len < 0 || off+len > b.length) {
throw new IndexOutOfBoundsException();
}
if (eom && !ignoreEOM) {
throw new LogicalEOMException("logical end-of-media");
}
int n = tapeWrite(b, off, len);
while (n < len) {
n += tapeWrite(b, off + n, len - n);
}
}
public void close() throws IOException {
BasicTapeDevice.this.close();
}
}
protected void finalize() {
try {
close();
} catch (IOException ex) {
}
}
private void ensureOpen() throws IOException {
if (fd == null || !fd.valid()) {
throw new IOException("tape device is not open");
}
}
private static native void initFields();
private native void tapeOpen(String pathName) throws IOException;
private native void tapeClose() throws IOException;
private native int tapeRead(byte[] b, int off, int len) throws IOException;
private native int tapeWrite(byte[] b, int off, int len) throws IOException;
private native int tapeGetBlockSize() throws IOException;
private native void tapeSetBlockSize(int bs) throws IOException;
private native void tapeRewind() throws IOException;
private native void tapeSpaceEOD() throws IOException;
/* load the JNI library specific for this platform */
static {
StringBuffer buf = new StringBuffer("Tape");
String osName = System.getProperty("os.name");
if (osName.equals("Windows NT") || osName.equals("Windows 2000")) {
buf.append("WinNT");
} else {
buf.append(osName);
}
System.loadLibrary(buf.toString());
initFields();
}
}
WHAT I HAVE TRIED
I have looked around that what I need is to include the path of the folder which contains the file TapeLinux.c
I have tried all these answers and nothing change
Can you please help me to figure out how I can use JNI in this situation and what I should configure to run my code
Thanks
Since you are on Linux, the message ...main java.lang.UnsatisfiedLinkError: no TapeLinux in java... likely means the library named libTapeLinux.so could not be found.
Seems you are searching for a solution by trying to locate TapeLinux.c and you should be searching for libTapeLinux.so and once you find it make sure libTapeLinux.so is on the load path.