I tried all the suggestions in this related question and still get the last error
library(rJava)
.jinit(force.init = T)
.jaddClassPath(dir('~/Dropbox/R_packages/JavaJS/',full.names = TRUE)))
mol.db <- "~/Downloads/SEPULVEDA_MOLECULAR.accdb"
jfile = .jnew('java/io/File',mol.db)
dbbo <- .jnew("com/healthmarketscience/jackcess/DatabaseBuilder")
dbbo <- .jcall(dbbo,"Lcom/healthmarketscience/jackcess/DatabaseBuilder;","setFile",jfile)
db <- .jcall(dbbo,"Lcom/healthmarketscience/jackcess/Database;","open",evalArray = FALSE,evalString = FALSE) # fails!!!!
Error in .jcall(dbbo, "Lcom/healthmarketscience/jackcess/Database;", "open", :
java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
Here is the result of .jclassPath()
"/Users/JS/Dropbox/R_packages/library/rJava/java"
"/Users/JS/Dropbox/R_packages/JavaJS/commons-codec-1.10"
"/Users/JS/Dropbox/R_packages/JavaJS/commons-lang-2.6"
"/Users/JS/Dropbox/R_packages/JavaJS/commons-logging-1.1.3"
"/Users/JS/Dropbox/R_packages/JavaJS/hsqldb-2.2.8.jar"
"/Users/JS/Dropbox/R_packages/JavaJS/jackcess-2.1.6.jar" "/Users/JS/Dropbox/R_packages/JavaJS/log4j-1.2.7.jar"
"/Users/JS/Dropbox/R_packages/JavaJS/poi-3.9"
"/Users/JS/Dropbox/R_packages/JavaJS/ucanaccess-3.0.7.jar"
sessionInfo()
R version 3.3.2 (2016-10-31)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X El Capitan 10.11.6
locale:
1 en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
1 stats graphics grDevices utils datasets methods base
other attached packages:
1 rJava_0.9-8 tibble_1.2 datapasta_1.0.0 rlist_0.4.6.1 pipeR_0.6.1.3 janitor_0.2.1 data.table_1.10.0
loaded via a namespace (and not attached):
1 magrittr_1.5 R6_2.2.0 assertthat_0.1 tools_3.3.2 DBI_0.5-1 dplyr_0.5.0 Rcpp_0.12.8
Thanks for any help!
I am totally new to MPJ which is an API for developing MPI based programs in Java. I wrote a simple code as follows:
import mpi.MPI;
import mpi.Status;
public class Send {
public static void main(String[] args) throws Exception
{
MPI.Init(args);
int rank = MPI.COMM_WORLD.Rank();
int size = MPI.COMM_WORLD.Size();
int peer;
int buffer[] = new int[10];
int len = 1;
int dataToBeSent = 99;
int tag = 100;
if(rank == 0)
{
buffer[0] = dataToBeSent;
peer = 1;
MPI.COMM_WORLD.Send(buffer, 0, len, MPI.INT, peer, tag);
System.out.println("process <"+rank+"> sent a msg to process <"+peer+">");
}
else if(rank == 1)
{
peer = 0 ;
Status status = MPI.COMM_WORLD.Recv(buffer, 0, buffer.length, MPI.INT, peer, tag);
System.out.println("process <"+rank+"> recv'ed a msg\n"+ "\tdata <"+buffer[0]+"> \n"+"\tsource <"+status.source+"> \n"+"\ttag<"+status.tag+"> \n"+"\tcount <"+status.count +">");
}
MPI.Finalize();
}
}
When I compile, I get the following error:
Exception in thread "main" java.lang.UnsupportedClassVersionError: mpi/MPI : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at Send.main(Send.java:7)
Java Result: 1
To resolve this issue, I came to know that both my JDK and JRE versions must be the same. After executing the following commands, I found that they are same and not different:
C:\Users\Dev>javac -version
javac 1.6.0
C:\Users\Dev>java -version
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Client VM (build 1.6.0-b105, mixed mode, sharing)
In Ubuntu Java 8, I get the following Exception:
Exception in thread "main" mpi.MPIException: Usage: java MPI <myrank> <conf_file> <device_name> conf_file can be, ../conf/xdev.conf <Local>OR http://holly.dsg.port.ac.uk:15000/xdev.conf <Remote>
at mpi.MPI.Init(MPI.java:233)
at mpi.MPI.Init(MPI.java:233) at mpi.MPI.Init(MPI.java:233)
at Send.main(Send.java:7)
Java Result: 1
How do I resolve this issue and get MPI running on my system in Java?
This is an old question but I think I can summarize what happened here, having used this library myself.
The compilation error that you obtained, "Unsupported major.minor version 51.0" indicates that the version of java you are using to run your program is too old. Most likely some parts of your program were compiled with a newer version of Java. Probably the MPJ library you downloaded?
When you tried to run your program with Java 8, you actually solved this problem on your own! However, as you correctly identified in the second half of your question, you still have a problem with the arguments of your program. The MPJ-express main expects some specific arguments to know how many processes are being launched. In the absence of these arguments, you get the error Exception in thread "main" mpi.MPIException: Usage: java MPI <myrank> <conf_file> <device_name>
Basically, the MPJ-Express library comes with a number of small scripts that will arrange the MPI specific arguments for you. Depending on the mode (multicore / cluster) that you want to use, the script and the procedure will be different. All the details are explained in the guides available on this page: http://mpj-express.org/guides.html. If that's what you are using, you can also launch programs from within the Eclipse IDE.
Goal: check java's version on a machine (I can get this from java -version). Compare it with latest available from java website
I would like to know if there is any way I can check for latest Java releases assuming that I have JRE/JDK installed on a machine.
If I can do this through Java itself, my solution would become platform independent. I could use java.net.URL class to send a request to Java website and get the HTML, however the response would be dynamic as Oracle can change their website and styles and possibly will have maintenance issues in long run.
I have looked at javatester.org, but I would not want it through an applet but through command line (which I can add to a script).
Through javacpl.exe, I can schedule periodic checks, but I would like to do it on demand.
The answer is actually quite simple. http://java.com/en/download/testjava.jsp issues a request to http://java.com/applet/JreCurrentVersion2.txt. That file currently contains a single version number: '1.7.0_11'...which is the latest and greatest, indeed.
Java code example
try (BufferedReader br = new BufferedReader(new InputStreamReader(new URL(
"http://java.com/applet/JreCurrentVersion2.txt").openStream()))) {
String fullVersion = br.readLine();
String version = fullVersion.split("_")[0];
String revision = fullVersion.split("_")[1];
System.out.println("Version " + version + " revision " + revision);
} catch (IOException e) {
// handle properly
}
Update 2014-03-20
Eventhough Java 8 was recently released http://java.com/applet/JreCurrentVersion2.txt currently still returns 1.7.0_51.
Update 2016-07-13
Looks like we need to come back to this every few months... Currently you need to scan http://java.com/en/download/installed8.jsp for a JavaScript variable latest8Version. So, you could run curl -s https://java.com/en/download/installed8.jsp | grep latest8Version.
Update 2018-08-19
http://javadl-esd-secure.oracle.com/update/baseline.version is another hot spot as mentioned in some other answer.
An URL very similar to the now defunct "JreCurrentVersion2.txt":
http://javadl-esd-secure.oracle.com/update/baseline.version
The contents of the link look like this:
1.8.0_111
1.7.0_121
1.6.0_131
1.5.0_99
1.4.2_43
You can easily parse the contents to find the latest JRE versions.
UPDATE: I don't recommend this method because this JRE is the one that has the Ask.com toolbar. You're better off downloading it yourself and distributing it yourself.
The jusched.exe program accesses the following URL to find out what versions are available. I think it's less likely to change because jusched is installed on millions of computers.
https://javadl-esd-secure.oracle.com/update/1.7.0/map-m-1.7.0.xml
Here is a snippet of what it returns for me:
<?xml version="1.0" encoding="ISO-8859-1" standalone="yes" ?>
<java-update-map version="1.0">
<mapping>
<version>1.7.0_17</version>
<url>https://javadl-esd-secure.oracle.com/update/1.7.0/au-descriptor-1.7.0_25-b17.xml</url>
</mapping>
<mapping>
<version>1.7.0_21</version>
<url>https://javadl-esd-secure.oracle.com/update/1.7.0/au-descriptor-1.7.0_25-b17.xml</url>
</mapping>
</java-update-map>
To get the actual version that it is pointing to you have to fetch the above URL. Here is another snippet of what this XML looks like:
xml version="1.0" encoding="UTF-8" standalone="yes"?>
<!-- XML file to be staged anywhere, and pointed to by map.xml file -->
<java-update>
<information version="1.0" xml:lang="en">
<caption>Java Update - Update Available</caption>
<title>Java Update Available</title>
<description>Java 7 Update 25 is ready to install. Installing Java 7 Update 25 might uninstall the latest Java 6 from your system. Click the Install button to update Java now. If you wish to update Java later, click the Later button.</description>
<moreinfo>http://java.com/moreinfolink</moreinfo>
<AlertTitle>Java Update Available</AlertTitle>
<AlertText>A new version of Java is ready to be installed.</AlertText>
<moreinfotxt>More information...</moreinfotxt>
<url>http://javadl.sun.com/webapps/download/GetFile/1.7.0_25-b17/windows-i586/jre-7u25-windows-i586-iftw.exe</url>
<version>1.7.0_25-b17</version>
<post-status>https://nometrics.java.com</post-status>
<cntry-lookup>http://rps-svcs.sun.com/services/countrylookup</cntry-lookup>
<predownload></predownload>
<options>/installmethod=jau FAMILYUPGRADE=1 SPWEB=http://javadl-esd.sun.com/update/1.7.0/sp-1.7.0_25-b17</options>
<urlinfo>24595ec7f861bc67e572f1e4ad3992441335e1a7</urlinfo>
</information>
</java-update>
The version tag contains the full version number.
You could parse the Java SE Downloads page to extract the Java versions.
That way, you get the version of both JDK6 and JDK7, which allows you to test your particular JDK (6 or 7) against the latest Oracle one.
(As opposed to the Free Java Download page, which only lists the JDK7)
Her is a crude script in Go, which you can compile on Windows, Unix, MacOs into a single independent executable, and use within a command line or a script:
package main
import (
"bytes"
"encoding/xml"
"fmt"
"io/ioutil"
"net/http"
"os/exec"
"regexp"
)
type Jdk struct {
Url string
Ver string
update string
}
func main() {
resp, err := http.Get("http://www.oracle.com/technetwork/java/javase/downloads/index.html")
if err != nil {
fmt.Printf("Error on http Get: %v\n", err)
return
}
bodyb, err := ioutil.ReadAll(resp.Body)
if err != nil {
fmt.Printf("QueriesForOwner: error in ReadAll: %v\n", err)
return
}
br := bytes.NewBuffer(bodyb)
jdkre, err := regexp.Compile(`h3[^\r\n]+(/technetwork/java/javase/downloads/(jdk(?:6|7)(?:u(\d+))?)-downloads-\d+\.html)`)
if err != nil {
fmt.Printf("extract: error in regexp compilation: %v\n", err)
return
}
jdks := jdkre.FindAllSubmatch(br.Bytes(), -1)
jdk7 := Jdk{string(jdks[0][4]), string(jdks[0][5]), string(jdks[0][6])}
jdk6 := Jdk{string(jdks[1][7]), string(jdks[1][8]), string(jdks[1][9])}
fmt.Printf("Jdk7: %v\nJdk6: %v\n", jdk7, jdk6)
jver, err := exec.Command("java", "-version").CombinedOutput()
if err != nil {
fmt.Printf("*ExitError from java -version:", err)
return
}
fmt.Println("JVer: '", string(jver), "'")
jverre, err := regexp.Compile(`1.(\d).\d(?:_(\d+))"`)
jvers := jverre.FindSubmatch(jver)
jj := string(jvers[0])
jv := string(jvers[1])
ju := string(jvers[2])
jdk := jdk6
if jv == "7" {
jdk = jdk7
}
if jdk.update != ju {
fmt.Println("Local JDK *NOT* up-to-date: you have ", jj, ", Oracle has ", jdk.Ver)
} else {
fmt.Println("Local JDK *up-to-date*: you have ", jj, ", equals to Oracle, which has", jdk.Ver)
}
}
Again, this is a crude script, oriented toward JDK, and you would need to adapt it to your specific need, making its output and exit status match what you need for your script.
On my (PC) workstation, it returns:
Jdk7: {/technetwork/java/javase/downloads/jdk7u9-downloads-1859576.html jdk7u9 9}
Jdk6: {/technetwork/java/javase/downloads/jdk6u37-downloads-1859587.html jdk6u37 37}
JVer: ' java version "1.6.0_31"
Java(TM) SE Runtime Environment (build 1.6.0_31-b05)
Java HotSpot(TM) Client VM (build 20.6-b01, mixed mode, sharing)
'
Local JDK *NOT* up-to-date: you have 1.6.0_31" , Oracle has jdk6u37
I don't know what information you are exactly looking for, but you can get some version information using
System.getProperty("java.version");
If this is not what you're looking for, check the other available properties here:
http://docs.oracle.com/javase/6/docs/api/java/lang/System.html#getProperties()
As for the latest available version, I guess you'd have to parse this site manually:
http://java.com/en/download/index.jsp
The latest version is on there, currently it's
Version 7 Update 9
You write that this is not what you want because "Oracle can change their website and styles". However, you want to find out the latest version of Java by accessing their service (website in this case). As long as you're not paying for this, they have no obligation to you, and can change the service whenever they want without your consent. And even when you're a paying customer, the best you can hope for is that they will inform you of upcoming changes, and your maintenance issues will remain.
Remember, it's THEIR service you want to use.
I have solved a similar issue some time ago with this groovy script (disclaimer: is somehow a "toy" script):
#Grapes([
#Grab(group='org.ccil.cowan.tagsoup', module='tagsoup', version='1.2.1')
])
def slurper = new XmlSlurper(new org.ccil.cowan.tagsoup.Parser())
def url = new URL("http://www.java.com/download/manual.jsp")
def html
url.withReader { reader ->
html = slurper.parse(reader)
}
def lastJava = html.body.div.div.div.strong.text()
println "Last available java version: ${lastJava}"
println "Currently installed java version: ${System.properties["java.version"]}"
It yields something like:
Last available java version:
Version 7 Update 9
Currently installed java version: 1.7.0_07
If you want to avoid maintenance issues due to changes to the page structure, maybe a better option is to search for a line containing "Version x Update y".
To get all system variables
Properties properties = System.getProperties();
System.out.println(properties);
Sample output, this might be different in your system depending on your OS and Java JDK/JRE version.
{
java.runtime.name = Java(TM) SE Runtime Environment,
sun.boot.library.path = C:\Program Files\Java\jdk1.8.0_31\jre\bin,
java.vm.version = 25.31-b07,
java.vm.vendor = Oracle Corporation,
java.vendor.url = http://java.oracle.com/,
path.separator = ;,
idea.launcher.port = 7534,
java.vm.name = Java HotSpot(TM) 64-Bit Server VM,
file.encoding.pkg = sun.io,
user.country = NP,
user.script = ,
sun.java.launcher = SUN_STANDARD,
sun.os.patch.level = ,
java.vm.specification.name = Java Virtual Machine Specification,
user.dir = C:\Users\...\roid,
java.runtime.version = 1.8.0_31-b13,
java.awt.graphicsenv = sun.awt.Win32GraphicsEnvironment,
java.endorsed.dirs = C:\Program Files\Java\jdk1.8.0_31\jre\lib\endorsed,
os.arch = amd64,
java.io.tmpdir = C:\Windows\TEMP\,
line.separator = ,
java.vm.specification.vendor = Oracle Corporation,
user.variant = ,
os.name = Windows 8.1,
sun.jnu.encoding = Cp1252,
java.library.path = C:\Program...roid,
java.specification.name = Java Platform API Specification,
java.class.version = 52.0,
sun.management.compiler = HotSpot 64-Bit Tiered Compilers,
os.version = 6.3,
user.home = C:\Users\Xxx,
user.timezone = Asia/Kathmandu,
java.awt.printerjob = sun.awt.windows.WPrinterJob,
file.encoding = UTF-8,
idea.launcher.bin.path = C:\Program Files (x86)\xxx\bin,
java.specification.version = 1.8,
java.class.path = C:\Program Files\Java\jdk1.8.0_31\jre\lib\charsets.jar;...,
user.name = Xxx,
java.vm.specification.version = 1.8,
sun.java.command = com.xxxx.ameras,
java.home = C:\Program Files\Java\jdk1.8.0_31\jre,
sun.arch.data.model = 64,
user.language = en,
java.specification.vendor = Oracle Corporation,
awt.toolkit = sun.awt.windows.WToolkit,
java.vm.info = mixed mode,
java.version = 1.8.0_31,
java.ext.dirs = C:\Program Files\Java\jdk1.8.0_31\jre\lib\ext;...,
java.vendor = Oracle Corporation,
file.separator = \,
java.vendor.url.bug = http://bugreport.sun.com/bugreport/,
sun.io.unicode.encoding = UnicodeLittle,
sun.cpu.endian = little,
sun.desktop = windows,
sun.cpu.isalist = amd64
}
Retrive only specific variable
String javaVersion = System.getProperty("java.version");
System.out.println(javaVersion);
Output
1.8.0_31
#MarcelStör's solution no longer works - the version in the file is 1.8.0_51, while the actual latest version is 1.8.0_91/92. If you go to the Java test page in Firefox or Chrome and open the development console you can get the variable latest8Version which currently is 1.8.0_91. This could be wrapped in a Selenium/Firefox solution, but is an incredibly hacky way of getting this information.
System.getProperty("java.vm.specification.version");
System.getProperty("java.version");
Before anyone screams about EOL'ed JDK, I'd like to point out that my question is not about how to compile the following. There is a real question here and it's not about JDK 1.5 being EOL'ed...
The following under JDK 1.5, up to 1.5.0_22 (the last one I could find) produces on my system a compiler error:
private Object[] boozinga() {
boolean b = Math.abs(42) > 0;
Object[] res = new Object[1];
res[0] = b ? new int[1] : new String[1];
return res;
}
Changing the Math.abs(42) > 0 to true allows compilation.
Changing the ternary "assignment" to an if/else allows compilation.
Using JDK 1.6 allows compilation.
So I was wondering: is there something not legal in the above code under Java 1.5 and that is allowed under Java 1.6?
Does it crash for those of you that are under Java 1.5 too?
The crash says something like this:
An exception has occured in the
compiler (1.5.0_22). Please file a bug
at the Java Developer Connection
(http://java.sun.com/webapps/bugreport)
after checking the Bug Parade for
duplicates. Include your program and
the following diagnostic in your
report. Thank you.
I take it filling a bug report for an EOL'ed JDK is an exercice in futility but still, I'd still like to know if the above is valid Java 1.5 code or not.
I think it is legal. The evidence is that JDK 1.6.0_21 compiles it with options -source 1.5 -target 1.5. Can't you use JDK 1.6 with these options to compile and JRE 1.5 to run?
It crashes for me, too (JDK 1.5.0_12). It crashes for me even with:
public Object boozinga() {
boolean b = true;
Object res = b ? new int[1] : new String[1];
return res;
}
The difficulty for the compiler is that the type of b ? new int[1] : new String[1] is java.lang.Object & java.io.Serializable & java.lang.Cloneable.
The problem here is that the compiler has trouble to decide the type of the expression b ? new int[1] : new String[1]. I had something like this before (with 1.1.8 or 1.2, I think - but with a real error message, not a compiler crash), and then simply used a cast to help the compiler here.
res[0] = b ? (Object)new int[1] : new String[1];
I didn't look what the language specification says about this - but the compiler should never crash with an exception, it should give a real error message.