使用java.library.path和LD_LIBRARY_PATH之间的区别

第一种形式

-Djava.library.path=/path

将在java字节码级别处理，

System.loadLibrary

Runtime.loadLibary

java/lang/ClassLoader.loadLibrary

ClassLoader.loadLibrary

java.library.path

dlopen/dlsym

这种形式的好处是，如果您的库路径存在问题，您将在Java代码中得到错误，警告或异常。

// Invoked in the java.lang.Runtime class to implement load and loadLibrary.static void loadLibrary(Class fromClass, String name,  boolean isAbsolute) {    ClassLoader loader =        (fromClass == null) ? null : fromClass.getClassLoader();    if (sys_paths == null) {        usr_paths = initializePath("java.library.path");        sys_paths = initializePath("sun.boot.library.path");    }    if (isAbsolute) {        if (loadLibrary0(fromClass, new File(name))) { return;        }        throw new UnsatisfiedlinkError("Can't load library: " + name);    }// ....

第二种形式

export LD_LIBRARY_PATH=/path

根据的文件，将以本机处理

dlopen/dlsym

 dlopen()   The function dlopen() loads the dynamic library file named by the null-terminated string filename and returns an opaque  "handle"  for  the   dynamic  library.   If  filename is NULL, then the returned handle is for the main program.  If filename contains a slash ("/"), then it is   interpreted as a (relative or absolute) pathname.  Otherwise, the dynamic linker searches for the library as follows (see ld.so(8) for fur‐   ther details):   o   (ELF  only)  If  the  executable  file for the calling program contains a DT_RPATH tag, and does not contain a DT_RUNPATH tag, then the       directories listed in the DT_RPATH tag are searched.   o   If, at the time that the program was started, the environment variable LD_LIBRARY_PATH was defined to contain a colon-separated list of       directories, then these are searched.  (As a security measure this variable is ignored for set-user-ID and set-group-ID programs.)

这样，如果您的库路径存在一些问题，并且系统无法加载您的库，则系统不会提供太多线索，会提示发生什么，并且会静默地失败（我想）。这取决于是否执行

LD_LIBRARY_PATH

LD_LIBRARY_PATH