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java destination
================
java destination gives an abstract class to implement destinations based on Java
If you want to implement a java destination, you should extend SyslogNgDestination abstract class
which is contained by the syslog-ng-core.jar which jar file will be in the moduledir after make install
Example implementation of a dummy destination
```
import org.syslog_ng.*;
public class TestClass extends TextLogDestination {
public TestClass(long handle) {
super(handle);
}
public boolean init()
{
System.out.println("START");
System.out.println("Initialize test destination");
return true;
}
public void deinit()
{
System.out.println("Deinitialize object");
}
public boolean queue(String message)
{
System.out.println("This is queue!" + message);
return true;
}
public boolean flush()
{
return true;
}
}
```
You need compile your written java based destination to create a .class or a .jar file
```
javac -cp /usr/lib/syslog-ng/syslog-ng-core.jar TestClass.java
```
You have to set the path of the class file or the name of the jar file (with full path) in the syslog-ng config
Example configuration for this (if you compiled the java file above, and the class file is in the /tmp directory):
```
@version: 3.28
options {
threaded(yes);
};
source s_tcp{
tcp(
port(5555)
);
};
destination d_java{
java(
class_name("TestClass")
class_path("/tmp")
option("key", "value")
);
};
log{
source(s_tcp);
destination(d_java);
flags(flow-control);
};
```
Example configuration using jar files in the class_path (the path inside the jar file has to been set using '.'):
```
@version: 3.28
options {
threaded(yes);
};
source s_local {
internal();
};
source s_network {
tcp(port(5555));
};
destination d_elastic {
elasticsearch2(
client-lib-dir("/usr/share/elasticsearch/lib/")
index("syslog-${YEAR}.${MONTH}.${DAY}")
type("syslog")
time-zone("UTC")
client-mode("http")
cluster-url("http://node01:9200 http://node02:9200")
);
};
log {
source(s_network);
destination(d_elastic);
flags(flow-control);
};
```
Trouble shooting
----------------
### Set library path
If you want to use the syslog-ng java destination you have to add the path of the libjvm.so to the LD_LIBRARY_PATH
so if you get the following error, it means, that the LD_LIBRARY_PATH does not contain the path of libjvm and you have to set it:
```
Error opening plugin module; module='mod-java', error='libjvm.so: cannot open shared object file: No such file or directory'
```
|
