What exactly are you trying to do with this class? This class appears to be an internal JDK implementation class related to the javax.imageio package. I wrote a simple example yesterday with only JAVA_HOME defined and %JAVA_HOME%/bin in my path and the class loaded fine without me having to explicitly load the native library. In fact, when I tried to load it explicitly, I got an error saying that the library had already been loaded...
> On Aug 29, 2017, at 7:14 AM, Martin Gainty <[email protected]> wrote: > > > > > ________________________________ > From: Robert Patrick <[email protected]> > Sent: Monday, August 28, 2017 5:34 PM > To: Maven Users List > Subject: RE: dll hell > > Since you mentioned DLLs in the subject, I assume this is Windows. > > Is the %JAVA_HOME%/jre/bin directory (where jpeg.dll lives) in the PATH? > > MG>%JAVA_HOME%/jre/bin is on the path and %JAVA_HOME%/jre/bin on > java.library.path > MG> > String mPath = > "C:\\Java\\JDK1.8\\jre\\bin"; > String langKey = "java.library.path" ; > System.setProperty ( langKey, mPath ); > MG>verified by successful System.load("JDK1.8/jre/bin/jpeg.dll") > > MG>C:\MAVEN-~1\MA095B~1\APACHE~1>dir %JAVA_HOME%\jre\bin\jpeg.dll > MG> Directory of C:\Java\jdk1.8\jre\bin > MG> 05/03/2015 07:05 PM 185,768 jpeg.dll > > MG> /** Sets up per-writer native structure and returns a pointer to it. */ > MG> private native long initJPEGImageWriter(); > > MG>which causes: > MG>Caused by: java.lang.UnsatisfiedLinkError: > JPEGImageWriter.initJPEGImageWriter()J > > MG>openjdk suggests re-making the jpeg.dll with USE_SYSTEM_JPEG=true directive > MG>https://urldefense.proofpoint.com/v2/url?u=https-3A__marc.info_-3Fl-3Dopenjdk-2Ddistro-2Dpkg-2Ddev-26m-3D136573001932634-26w-3D2&d=DwIFAw&c=RoP1YumCXCgaWHvlZYR8PQcxBKCX5YTpkKY057SbK10&r=Ql5uwmbofQMW0iErugdCnFgO-CBGr_pt_OzwdxJosG0&m=VajCl24eKyVkpuuL2_5eMx4D_cDqnCwFGIiTFU_bVtM&s=inOW5Sns-TKwPr9vvINfZaWS-csOsVFRCMhhjgQVwZ8&e= > > > MG>i read somewhere that JNIEXPORT needs to be declared for each function in > the C dll for jpeg.dll > MG>At present i dont know how to to reverse engineer jpeg.dll to add > JNIEXPORT signature for these functions > > MG>Which option do you suggest? > MG>Thanks Patrick > MG>Martin- > > -----Original Message----- > From: Martin Gainty [mailto:[email protected]] > Sent: Monday, August 28, 2017 4:25 PM > To: [email protected] > Subject: dll hell > > attempting to call native long initJPEGImageWriter(); in JPEGImageWriter > ..when i call initJPEGImageWriter i get: > > > java.lang.UnsatisfiedLinkError: JPEGImageWriter.initJPEGImageWriter() > > > ive read System.loadLibrary("jpeg") in static initialiser is "supposed to > load" jpeg library: > > > static { > java.security.AccessController.doPrivileged( > new java.security.PrivilegedAction<Void>() > { > public Void run() { > System.loadLibrary("jpeg"); > } //end run > }); //end doPrivileged/PrivilegedAction } //end static > > > is supposed to load library but > > > when i call initJPEGImageWriter i get > > > java.lang.UnsatisfiedLinkError: JPEGImageWriter.initJPEGImageWriter() > > > advice appreciated > > Martin > ______________________________________________ > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
