Jdk1.6.0 45 For Mac
I run Eclipse and on my MacBook Pro. 2 days ago I installed the latest JDK on my machine and noticed that the whole application became very sluggish. Further tests seem to indicate that any network comms, including the TCP/IP socket connection between and mysql are experiencing serious delays. I read the release notes for the latest JDK and there were some passing references to DNS.
Apr 21, 2017 - Yesterday I updated Java to 'Version 8 Update 131 (build. Checkpoint SSL Network Extender on a Mac, I suggest not updating Java until they.
This only seems to effect my app on OS X, I've tried Windows and it does not seem to occur. The following InetAddress.getLocalHost.getHostName takes much longer on my Mac with 1.8.0.60 than it does with the previous version. So - how do I revert the default JDK on my Mac to the previous version.
Re-installing the older JDK does not seem to help and nothing in the Java control panel appears to let you select the default. I'm assuming I need to do something at the Command prompt. Any advice on how to back out the current JDK would be great, also any confirmation of this problem with this version on a OS X machine would be re-assuring.
I found mySQL database io particularly noticeable. In Eclipse, you can define different JDK versions and specify which one to use by default or for a particular project. Use the output of the javahome utility to see where the different installed versions of the JDK reside. I was aware of the JAVAHOME environment variable but what had me a little confused was that when I used the command 'set' to see all my current environment variables it was not shown. So in my mind I assumed the current binary for java must be included on a path (excuse windows terminology). The implication of JAVAHOME therefore - in my mind at least it that when you run a java program the OS must load the 'default' java executable which then determines that it's not the default being pointed to by JAVAHOME and re-executes the one which is? That sounds horrible and is probably wrong, but for the sake of clarity if I open up a command prompt and type 'java -version' how does the OS find the current java executables (with and without the presence of JAVAHOME) Sorry if I'm over analysing only I like to have it clear in my mind if possible.
Perhaps I gave you too much information all at once. Here are a few of the important points: 1. JAVAHOME is an environment variable. On the other hand, javahome is a utility program that comes with XCode tools - you must download and install it.
Follow the link I gave earlier. You can run it directly with the appropriate command line arguments as explained in the OS X man page I cited or use the shell function I provided or whatever variation you prefer.
The javahome utility helps you easily manage the value of the JAVAHOME environment variable. To see just the environment variables in bash, use the env command instead. Or just use echo $JAVAHOME to see what the current value of JAVAHOME is 3. Please read through my previous posts carefully. If you install JDKs in OS X with default options, which I highly recommend, the link /usr/bin/java is created. If you want to see what that link points to, issue the command ls -l /usr/bin/java If you issue the command echo $PATH, /usr/bin should be included in it. That's about as far as I really care to follow the path to the Java that gets executed.
The rest that goes on under that I leave to the javahome utility to manage for me. About the problem you have with your program: The method InetAddress.getHostName will, in some circumstances, try to do a reverse DNS lookup to determine the hostname from a numerical IP address.
That can be a slow operation. I'd be very surprised if there's a difference between Java 8 update 51 and update 60 which causes this to behave differently. I've looked at the Java 8u60 release notes but the only thing about DNS has something to do with some specific Kerberos security thing, which is most likely not relevant for your program.
Are you sure something else hasn't changed in the configuration of your program, or in the network so that the reverse DNS lookup is slower? Regarding the initial problem with Java 1.8.060. Although the 1 line of code regarding name lookup was an easy example to quote the main problem for me is the net effect it has on jdbc. Specifically running against a local mySQL database.
I have just performed the same tests as before, which is 1) running my application from Eclipse specifying 1.8.051 as the runtime environment and updating a single record in a database table. This was instant, certainly in the milliseconds department. Then I repeated the same again using 1.8.060 (both from Eclipse) and running the jar file from the command prompt picking up the default runtime environment. The same single row in the same database table took 1-2 seconds to update.
Jdk1.6.0 45 For Mac Download
Jdk1.6.0 45 For Macbook Pro
No code changes whatsoever. I ran your program multiple times on my MacBook Pro (OS X 10.9.5), 2.3 GHz Intel Core i7, 16 GB 1600 Mhz DDR3 ram 1.8.051: between 7 and 11 1.8.060: initial 23, a couple of 431, but subsequently all between 8 and 11 1.8.060 did seem to trend more towards 9 & 10 while 1.8.051 trended more towards 8 & 9 but that seems negligible.
I repeated the runs for each version about 10 to 15 times. Edit: ran the program some more and there were occasional spikes with 1.8.060 to 12/14 but 1.8.051 would also occasionally spike up to 11/13. There does seem to be a consistently slightly longer run time with 1.8.060.
Sometimes, it is not possible to put a specific version of Java in the system path. It is still possible to use Capsis (compile and run it) without changing any environment variable.
This example is for Windows, it can be adapted for Mac and Linux. The two scripts to be modified ant.bat and capsis.bat are both located in the capsis4/ installation directory.