# Java 1.8.0_60 Problem (OSX) - revert to 1.8.0_51

posted 1 year ago

I run Eclipse and Java 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 jdbc and mysql are experiencing serious delays. I read the release notes for the latest JDK and there were some passing references to DNS. 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.

Dave

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.

Dave

posted 1 year ago

Check out the java_home utility. It helps you manage multiple versions of Java on OS X. Here's a function I defined as part of my shell environment to make the utility easier to use:

I put this function in a file called .aliases.bash which I source from .bash_profile:

This makes my terminals default to the latest JDK 1.8 version I have installed. I can easily change the version temporarily by running java_home with an appropriate argument in a new terminal window. I could also change the default by changing the appropriate line in .bash_profile.

To use a prior version of the JDK, I would run something like:

I put this function in a file called .aliases.bash which I source from .bash_profile:

This makes my terminals default to the latest JDK 1.8 version I have installed. I can easily change the version temporarily by running java_home with an appropriate argument in a new terminal window. I could also change the default by changing the appropriate line in .bash_profile.

To use a prior version of the JDK, I would run something like:

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posted 1 year ago

More info about java_home: https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/java_home.1.html

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posted 1 year ago

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 java_home utility to see where the different installed versions of the JDK reside. On my machine, the output is like this:

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posted 1 year ago

I was aware of the JAVA_HOME 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 JAVA_HOME 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 JAVA_HOME 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 JAVA_HOME)

Sorry if I'm over analysing only I like to have it clear in my mind if possible.

Dave

The implication of JAVA_HOME 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 JAVA_HOME 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 JAVA_HOME)

Sorry if I'm over analysing only I like to have it clear in my mind if possible.

Dave

posted 1 year ago

Perhaps I gave you too much information all at once.

Here are a few of the important points:

1. JAVA_HOME is an environment variable. On the other hand,

2. To see just the environment variables in bash, use the

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

If you issue the command

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 java_home utility to manage for me.

Here are a few of the important points:

1. JAVA_HOME is an environment variable. On the other hand,

**java_home**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 java_home utility helps you easily manage the value of the JAVA_HOME environment variable.2. To see just the environment variables in bash, use the

**env**command instead. Or just use`echo $JAVA_HOME`to see what the current value of JAVA_HOME is3. 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 java_home utility to manage for me.

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posted 1 year ago

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?

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?

posted 1 year ago

Regarding the initial problem with Java 1.8.0_60. 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 1.8.0_51 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 test again using 1.8.0_60 (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.

No code changes whatsoever.

Dave

I have just performed the same tests as before, which is 1) running my application from Eclipse specifying 1.8.0_51 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 test again using 1.8.0_60 (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.

No code changes whatsoever.

Dave

posted 1 year ago

I don't need to use that at all. It's just simpler to illustrate what I think it a bug in Java 1.8.0.60.

Let me be a little more scientific. I have created the following test program.

When I run in Java 1.8.0_51 the output looks like this.

When I run against Java 1.8.0_60 the output is like this.

In my application I only perform this once at startup so it's not an issue. But I suspect whatever is causing this command to become very slow is also responsible for the dramatic hit I'm seeing with mysql

Let me be a little more scientific. I have created the following test program.

**Please note this only seems to be an issue on OS X, I've not seen it with Windows.**When I run in Java 1.8.0_51 the output looks like this.

*1.8.0_51*

Iteration 1 current elapsed time 6

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Total test elapsed time :9

When I run against Java 1.8.0_60 the output is like this.

*1.8.0_60*

Iteration 1 current elapsed time 5027

Iteration 2 current elapsed time 10097

Iteration 3 current elapsed time 15163

Iteration 4 current elapsed time 20233

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Total test elapsed time :505220Iteration 1 current elapsed time 5027

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Total test elapsed time :505220

In my application I only perform this once at startup so it's not an issue. But I suspect whatever is causing this command to become very slow is also responsible for the dramatic hit I'm seeing with mysql

posted 1 year ago

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

1.8.0_51: between 7 and 11

1.8.0_60: initial 23, a couple of 431, but subsequently all between 8 and 11

1.8.0_60 did seem to trend more towards 9 & 10 while 1.8.0_51 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 1.8.0_60 to 12/14 but 1.8.0_51 would also occasionally spike up to 11/13. There does seem to be a consistently slightly longer run time with 1.8.0_60. Interesting.

1.8.0_51: between 7 and 11

1.8.0_60: initial 23, a couple of 431, but subsequently all between 8 and 11

1.8.0_60 did seem to trend more towards 9 & 10 while 1.8.0_51 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 1.8.0_60 to 12/14 but 1.8.0_51 would also occasionally spike up to 11/13. There does seem to be a consistently slightly longer run time with 1.8.0_60. Interesting.

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posted 1 year ago

This fellow found a deadlock: https://github.com/neo4j/neo4j/issues/5242

You may not have the same problem but perhaps it's time for a session with a proper profiler.

You may not have the same problem but perhaps it's time for a session with a proper profiler.

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