Java - Command line to run a class with another jvm
I've java 1.8.0_131 by default on my machine but also java 9, so can I run a compiled class with jdk-9? is it possible anything like this:
java -v path/to/jdk-9 myClass
Thanks
java
asked Nov 23 '18 at 9:26
Jacopo SabatiniJacopo Sabatini
1
add a comment |
I've java 1.8.0_131 by default on my machine but also java 9, so can I run a compiled class with jdk-9? is it possible anything like this:
java -v path/to/jdk-9 myClass
Thanks
java
asked Nov 23 '18 at 9:26
Jacopo SabatiniJacopo Sabatini
1
2
No. But you can use the standard way:/path/to/jdk-9/bin/java MyClass
– JB Nizet
Nov 23 '18 at 9:28
No, this command is not possible. But you can run the class with the java command that comes with your Java9 installation.
– Henry
Nov 23 '18 at 9:28
If I'm not mistaken you can also change the default java version to always use jdk-9
– Andreas
Nov 23 '18 at 9:36
are you using Windows Mac or Linux
– preciousbetine
Nov 23 '18 at 9:40
add a comment |
I've java 1.8.0_131 by default on my machine but also java 9, so can I run a compiled class with jdk-9? is it possible anything like this:
java -v path/to/jdk-9 myClass
Thanks
java
asked Nov 23 '18 at 9:26
Jacopo SabatiniJacopo Sabatini
1
I've java 1.8.0_131 by default on my machine but also java 9, so can I run a compiled class with jdk-9? is it possible anything like this:
java -v path/to/jdk-9 myClass
Thanks
java
java
asked Nov 23 '18 at 9:26
Jacopo SabatiniJacopo Sabatini
1
asked Nov 23 '18 at 9:26
Jacopo SabatiniJacopo Sabatini
1
asked Nov 23 '18 at 9:26
Jacopo SabatiniJacopo Sabatini
1
asked Nov 23 '18 at 9:26
Jacopo SabatiniJacopo Sabatini
1
asked Nov 23 '18 at 9:26
Jacopo SabatiniJacopo Sabatini
1
1
2
No. But you can use the standard way:/path/to/jdk-9/bin/java MyClass
– JB Nizet
Nov 23 '18 at 9:28
No, this command is not possible. But you can run the class with the java command that comes with your Java9 installation.
– Henry
Nov 23 '18 at 9:28
If I'm not mistaken you can also change the default java version to always use jdk-9
– Andreas
Nov 23 '18 at 9:36
are you using Windows Mac or Linux
– preciousbetine
Nov 23 '18 at 9:40
add a comment |
2
No. But you can use the standard way:/path/to/jdk-9/bin/java MyClass
– JB Nizet
Nov 23 '18 at 9:28
No, this command is not possible. But you can run the class with the java command that comes with your Java9 installation.
– Henry
Nov 23 '18 at 9:28
If I'm not mistaken you can also change the default java version to always use jdk-9
– Andreas
Nov 23 '18 at 9:36
are you using Windows Mac or Linux
– preciousbetine
Nov 23 '18 at 9:40
2
2
No. But you can use the standard way:
/path/to/jdk-9/bin/java MyClass– JB Nizet
Nov 23 '18 at 9:28
No. But you can use the standard way:
/path/to/jdk-9/bin/java MyClass– JB Nizet
Nov 23 '18 at 9:28
No, this command is not possible. But you can run the class with the java command that comes with your Java9 installation.
– Henry
Nov 23 '18 at 9:28
No, this command is not possible. But you can run the class with the java command that comes with your Java9 installation.
– Henry
Nov 23 '18 at 9:28
If I'm not mistaken you can also change the default java version to always use jdk-9
– Andreas
Nov 23 '18 at 9:36
If I'm not mistaken you can also change the default java version to always use jdk-9
– Andreas
Nov 23 '18 at 9:36
are you using Windows Mac or Linux
– preciousbetine
Nov 23 '18 at 9:40
are you using Windows Mac or Linux
– preciousbetine
Nov 23 '18 at 9:40
add a comment |
2 Answers
2
active
oldest
votes
The java command actually invokes the JVM. That JVM starts up, and reads your classes, and runs what you tell it to run.
There is no way to tell the "starting" JVM to actually use a different JVM. java isn't some sort of wrapper that "later" invokes some binary. It is already the binary that starts the JVM.
In other words: what you are asking for isn't possible. A simple workaround can be to define "aliases" on the command line, like java-8 to start your java8 installation, and java-9 to point to that other installation.
answered Nov 23 '18 at 9:39
GhostCatGhostCat
91.1k1688147
add a comment |
By default java command call the installed java version which can be checked by command:
One way could be update the java:
sudo update-alternatives --config java.
O/P of above command:
Selection Path Priority Status
------------------------------------------------------------
0 /usr/lib/jvm/java-8-oracle/jre/bin/java 1081 auto mode
* 1 /usr/lib/jvm/java-8-oracle/jre/bin/java 1081 manual mode
Press <enter> to keep the current choice[*], or type selection number:
In your case java 9 will also come. update java version and run java command.
Or you can do directly call your java9 script which you can find ${Java9 Installation Directory}/jre/bin/java -v class.
PS: Above description of commands is based on ubuntu.
answered Nov 23 '18 at 10:07
saurav omarsaurav omar
767
add a comment |
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2 Answers
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active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
The java command actually invokes the JVM. That JVM starts up, and reads your classes, and runs what you tell it to run.
There is no way to tell the "starting" JVM to actually use a different JVM. java isn't some sort of wrapper that "later" invokes some binary. It is already the binary that starts the JVM.
In other words: what you are asking for isn't possible. A simple workaround can be to define "aliases" on the command line, like java-8 to start your java8 installation, and java-9 to point to that other installation.
answered Nov 23 '18 at 9:39
GhostCatGhostCat
91.1k1688147
add a comment |
The java command actually invokes the JVM. That JVM starts up, and reads your classes, and runs what you tell it to run.
There is no way to tell the "starting" JVM to actually use a different JVM. java isn't some sort of wrapper that "later" invokes some binary. It is already the binary that starts the JVM.
In other words: what you are asking for isn't possible. A simple workaround can be to define "aliases" on the command line, like java-8 to start your java8 installation, and java-9 to point to that other installation.
answered Nov 23 '18 at 9:39
GhostCatGhostCat
91.1k1688147
add a comment |
The java command actually invokes the JVM. That JVM starts up, and reads your classes, and runs what you tell it to run.
There is no way to tell the "starting" JVM to actually use a different JVM. java isn't some sort of wrapper that "later" invokes some binary. It is already the binary that starts the JVM.
In other words: what you are asking for isn't possible. A simple workaround can be to define "aliases" on the command line, like java-8 to start your java8 installation, and java-9 to point to that other installation.
answered Nov 23 '18 at 9:39
GhostCatGhostCat
91.1k1688147
The java command actually invokes the JVM. That JVM starts up, and reads your classes, and runs what you tell it to run.
There is no way to tell the "starting" JVM to actually use a different JVM. java isn't some sort of wrapper that "later" invokes some binary. It is already the binary that starts the JVM.
In other words: what you are asking for isn't possible. A simple workaround can be to define "aliases" on the command line, like java-8 to start your java8 installation, and java-9 to point to that other installation.
answered Nov 23 '18 at 9:39
GhostCatGhostCat
91.1k1688147
answered Nov 23 '18 at 9:39
GhostCatGhostCat
91.1k1688147
answered Nov 23 '18 at 9:39
GhostCatGhostCat
91.1k1688147
answered Nov 23 '18 at 9:39
GhostCatGhostCat
91.1k1688147
91.1k1688147
add a comment |
add a comment |
By default java command call the installed java version which can be checked by command:
One way could be update the java:
sudo update-alternatives --config java.
O/P of above command:
Selection Path Priority Status
------------------------------------------------------------
0 /usr/lib/jvm/java-8-oracle/jre/bin/java 1081 auto mode
* 1 /usr/lib/jvm/java-8-oracle/jre/bin/java 1081 manual mode
Press <enter> to keep the current choice[*], or type selection number:
In your case java 9 will also come. update java version and run java command.
Or you can do directly call your java9 script which you can find ${Java9 Installation Directory}/jre/bin/java -v class.
PS: Above description of commands is based on ubuntu.
answered Nov 23 '18 at 10:07
saurav omarsaurav omar
767
add a comment |
By default java command call the installed java version which can be checked by command:
One way could be update the java:
sudo update-alternatives --config java.
O/P of above command:
Selection Path Priority Status
------------------------------------------------------------
0 /usr/lib/jvm/java-8-oracle/jre/bin/java 1081 auto mode
* 1 /usr/lib/jvm/java-8-oracle/jre/bin/java 1081 manual mode
Press <enter> to keep the current choice[*], or type selection number:
In your case java 9 will also come. update java version and run java command.
Or you can do directly call your java9 script which you can find ${Java9 Installation Directory}/jre/bin/java -v class.
PS: Above description of commands is based on ubuntu.
answered Nov 23 '18 at 10:07
saurav omarsaurav omar
767
add a comment |
By default java command call the installed java version which can be checked by command:
One way could be update the java:
sudo update-alternatives --config java.
O/P of above command:
Selection Path Priority Status
------------------------------------------------------------
0 /usr/lib/jvm/java-8-oracle/jre/bin/java 1081 auto mode
* 1 /usr/lib/jvm/java-8-oracle/jre/bin/java 1081 manual mode
Press <enter> to keep the current choice[*], or type selection number:
In your case java 9 will also come. update java version and run java command.
Or you can do directly call your java9 script which you can find ${Java9 Installation Directory}/jre/bin/java -v class.
PS: Above description of commands is based on ubuntu.
answered Nov 23 '18 at 10:07
saurav omarsaurav omar
767
By default java command call the installed java version which can be checked by command:
One way could be update the java:
sudo update-alternatives --config java.
O/P of above command:
Selection Path Priority Status
------------------------------------------------------------
0 /usr/lib/jvm/java-8-oracle/jre/bin/java 1081 auto mode
* 1 /usr/lib/jvm/java-8-oracle/jre/bin/java 1081 manual mode
Press <enter> to keep the current choice[*], or type selection number:
In your case java 9 will also come. update java version and run java command.
Or you can do directly call your java9 script which you can find ${Java9 Installation Directory}/jre/bin/java -v class.
PS: Above description of commands is based on ubuntu.
answered Nov 23 '18 at 10:07
saurav omarsaurav omar
767
answered Nov 23 '18 at 10:07
saurav omarsaurav omar
767
answered Nov 23 '18 at 10:07
saurav omarsaurav omar
767
answered Nov 23 '18 at 10:07
saurav omarsaurav omar
767
767
add a comment |
add a comment |
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2
No. But you can use the standard way:
/path/to/jdk-9/bin/java MyClass– JB Nizet
Nov 23 '18 at 9:28
No, this command is not possible. But you can run the class with the java command that comes with your Java9 installation.
– Henry
Nov 23 '18 at 9:28
If I'm not mistaken you can also change the default java version to always use jdk-9
– Andreas
Nov 23 '18 at 9:36
are you using Windows Mac or Linux
– preciousbetine
Nov 23 '18 at 9:40