Check java version without java -version
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I get the following error while trying to compile or run everything that has to do with java or javac:
Error occurred during initialization of VM
java/lang/ClassNotFoundException: error in opening JAR file <Zip file open error> /usr/lib/jvm/java-8-oracle/jre/lib/rt.jar
I've read here that i should uninstall and install again JDK, here it is written that I should know which version of java I have installed on my pc in order to uninstall-it.
To check the version installed i run java -version but i get the error mentioned above, how can i check my java version without that command?
I know that i have installed java 8 but i don't know precisely which version it is.
java jdk
edited Apr 13 at 10:45
David Foerster
26.1k1361106
asked Apr 13 at 8:47
Zeno Raiser
16011
add a comment |Â
up vote
6
down vote
favorite
I get the following error while trying to compile or run everything that has to do with java or javac:
Error occurred during initialization of VM
java/lang/ClassNotFoundException: error in opening JAR file <Zip file open error> /usr/lib/jvm/java-8-oracle/jre/lib/rt.jar
I've read here that i should uninstall and install again JDK, here it is written that I should know which version of java I have installed on my pc in order to uninstall-it.
To check the version installed i run java -version but i get the error mentioned above, how can i check my java version without that command?
I know that i have installed java 8 but i don't know precisely which version it is.
java jdk
edited Apr 13 at 10:45
David Foerster
26.1k1361106
asked Apr 13 at 8:47
Zeno Raiser
16011
"I know that i have installed java 8 but i don't know precisely which version it is." Installed how?
– muru
Apr 13 at 12:14
add a comment |Â
up vote
6
down vote
favorite
up vote
6
down vote
favorite
I get the following error while trying to compile or run everything that has to do with java or javac:
Error occurred during initialization of VM
java/lang/ClassNotFoundException: error in opening JAR file <Zip file open error> /usr/lib/jvm/java-8-oracle/jre/lib/rt.jar
I've read here that i should uninstall and install again JDK, here it is written that I should know which version of java I have installed on my pc in order to uninstall-it.
To check the version installed i run java -version but i get the error mentioned above, how can i check my java version without that command?
I know that i have installed java 8 but i don't know precisely which version it is.
java jdk
edited Apr 13 at 10:45
David Foerster
26.1k1361106
asked Apr 13 at 8:47
Zeno Raiser
16011
I get the following error while trying to compile or run everything that has to do with java or javac:
Error occurred during initialization of VM
java/lang/ClassNotFoundException: error in opening JAR file <Zip file open error> /usr/lib/jvm/java-8-oracle/jre/lib/rt.jar
I've read here that i should uninstall and install again JDK, here it is written that I should know which version of java I have installed on my pc in order to uninstall-it.
To check the version installed i run java -version but i get the error mentioned above, how can i check my java version without that command?
I know that i have installed java 8 but i don't know precisely which version it is.
java jdk
java jdk
edited Apr 13 at 10:45
David Foerster
26.1k1361106
asked Apr 13 at 8:47
Zeno Raiser
16011
edited Apr 13 at 10:45
David Foerster
26.1k1361106
asked Apr 13 at 8:47
Zeno Raiser
16011
edited Apr 13 at 10:45
David Foerster
26.1k1361106
edited Apr 13 at 10:45
David Foerster
26.1k1361106
edited Apr 13 at 10:45
David Foerster
26.1k1361106
26.1k1361106
asked Apr 13 at 8:47
Zeno Raiser
16011
asked Apr 13 at 8:47
Zeno Raiser
16011
asked Apr 13 at 8:47
Zeno Raiser
16011
16011
"I know that i have installed java 8 but i don't know precisely which version it is." Installed how?
– muru
Apr 13 at 12:14
add a comment |Â
"I know that i have installed java 8 but i don't know precisely which version it is." Installed how?
– muru
Apr 13 at 12:14
"I know that i have installed java 8 but i don't know precisely which version it is." Installed how?
– muru
Apr 13 at 12:14
"I know that i have installed java 8 but i don't know precisely which version it is." Installed how?
– muru
Apr 13 at 12:14
add a comment |Â
4 Answers
4
active
oldest
votes
up vote
2
down vote
accepted
You can use this command for checking your java version:
update-alternatives --config java
edited Apr 18 at 6:49
Campa
366411
answered Apr 13 at 9:00
Eranda Peiris
661416
7
Wouldn'tupdate-alternatives --display javabe simpler and better since OP only wants to “display†available Java versions, not change the default? That wouldn't even requiresudo.
– David Foerster
Apr 13 at 10:47
add a comment |Â
up vote
6
down vote
To show what version of Java is installed without running java -version, open the terminal and type:
apt policy openjdk-* oracle-java*
A small part of the results of apt policy openjdk-* looks like this:
openjdk-7-jre-lib:
Installed: (none)
Candidate: (none)
Version table:
openjdk-8-jdk:
Installed: 8u162-b12-0ubuntu0.16.04.2
Candidate: 8u162-b12-0ubuntu0.16.04.2
Search for sections that contain either openjdk-*-jre , openjdk-*-jdk or oracle-java* where the wildcard * character can be a Java version number like 6, 7, 8 or 9.
answered Apr 13 at 8:53
karel
50.5k11107127
thanks, with that command i got tons of lines which one should i search for?
– Zeno Raiser
Apr 13 at 8:57
add a comment |Â
up vote
4
down vote
You can discover the full path of the default java executable with:
readlink -f "$(which java)"
All (sane) Java packages or bundles that I know use installation path names that include the vendor name and major version number which would answer your question. E. g. on my system
$ readlink -f "$(which java)"
/usr/lib/jvm/java-9-openjdk-amd64/bin/java
tells me that the default Java installation is OpenJDK 9.
answered Apr 13 at 10:54
David Foerster
26.1k1361106
add a comment |Â
up vote
2
down vote
You could also try:
dpkg -l | egrep -i 'jre|java|jdk'
edited Apr 13 at 10:50
David Foerster
26.1k1361106
answered Apr 13 at 10:17
muclux
2,1231522
add a comment |Â
4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
accepted
You can use this command for checking your java version:
update-alternatives --config java
edited Apr 18 at 6:49
Campa
366411
answered Apr 13 at 9:00
Eranda Peiris
661416
7
Wouldn'tupdate-alternatives --display javabe simpler and better since OP only wants to “display†available Java versions, not change the default? That wouldn't even requiresudo.
– David Foerster
Apr 13 at 10:47
add a comment |Â
up vote
2
down vote
accepted
You can use this command for checking your java version:
update-alternatives --config java
edited Apr 18 at 6:49
Campa
366411
answered Apr 13 at 9:00
Eranda Peiris
661416
7
Wouldn'tupdate-alternatives --display javabe simpler and better since OP only wants to “display†available Java versions, not change the default? That wouldn't even requiresudo.
– David Foerster
Apr 13 at 10:47
add a comment |Â
up vote
2
down vote
accepted
up vote
2
down vote
accepted
You can use this command for checking your java version:
update-alternatives --config java
edited Apr 18 at 6:49
Campa
366411
answered Apr 13 at 9:00
Eranda Peiris
661416
You can use this command for checking your java version:
update-alternatives --config java
edited Apr 18 at 6:49
Campa
366411
answered Apr 13 at 9:00
Eranda Peiris
661416
edited Apr 18 at 6:49
Campa
366411
edited Apr 18 at 6:49
Campa
366411
edited Apr 18 at 6:49
Campa
366411
366411
answered Apr 13 at 9:00
Eranda Peiris
661416
answered Apr 13 at 9:00
Eranda Peiris
661416
answered Apr 13 at 9:00
Eranda Peiris
661416
661416
7
Wouldn'tupdate-alternatives --display javabe simpler and better since OP only wants to “display†available Java versions, not change the default? That wouldn't even requiresudo.
– David Foerster
Apr 13 at 10:47
add a comment |Â
7
Wouldn'tupdate-alternatives --display javabe simpler and better since OP only wants to “display†available Java versions, not change the default? That wouldn't even requiresudo.
– David Foerster
Apr 13 at 10:47
7
7
Wouldn't
update-alternatives --display java be simpler and better since OP only wants to “display†available Java versions, not change the default? That wouldn't even require sudo.– David Foerster
Apr 13 at 10:47
Wouldn't
update-alternatives --display java be simpler and better since OP only wants to “display†available Java versions, not change the default? That wouldn't even require sudo.– David Foerster
Apr 13 at 10:47
add a comment |Â
up vote
6
down vote
To show what version of Java is installed without running java -version, open the terminal and type:
apt policy openjdk-* oracle-java*
A small part of the results of apt policy openjdk-* looks like this:
openjdk-7-jre-lib:
Installed: (none)
Candidate: (none)
Version table:
openjdk-8-jdk:
Installed: 8u162-b12-0ubuntu0.16.04.2
Candidate: 8u162-b12-0ubuntu0.16.04.2
Search for sections that contain either openjdk-*-jre , openjdk-*-jdk or oracle-java* where the wildcard * character can be a Java version number like 6, 7, 8 or 9.
answered Apr 13 at 8:53
karel
50.5k11107127
thanks, with that command i got tons of lines which one should i search for?
– Zeno Raiser
Apr 13 at 8:57
add a comment |Â
up vote
6
down vote
To show what version of Java is installed without running java -version, open the terminal and type:
apt policy openjdk-* oracle-java*
A small part of the results of apt policy openjdk-* looks like this:
openjdk-7-jre-lib:
Installed: (none)
Candidate: (none)
Version table:
openjdk-8-jdk:
Installed: 8u162-b12-0ubuntu0.16.04.2
Candidate: 8u162-b12-0ubuntu0.16.04.2
Search for sections that contain either openjdk-*-jre , openjdk-*-jdk or oracle-java* where the wildcard * character can be a Java version number like 6, 7, 8 or 9.
answered Apr 13 at 8:53
karel
50.5k11107127
thanks, with that command i got tons of lines which one should i search for?
– Zeno Raiser
Apr 13 at 8:57
add a comment |Â
up vote
6
down vote
up vote
6
down vote
To show what version of Java is installed without running java -version, open the terminal and type:
apt policy openjdk-* oracle-java*
A small part of the results of apt policy openjdk-* looks like this:
openjdk-7-jre-lib:
Installed: (none)
Candidate: (none)
Version table:
openjdk-8-jdk:
Installed: 8u162-b12-0ubuntu0.16.04.2
Candidate: 8u162-b12-0ubuntu0.16.04.2
Search for sections that contain either openjdk-*-jre , openjdk-*-jdk or oracle-java* where the wildcard * character can be a Java version number like 6, 7, 8 or 9.
answered Apr 13 at 8:53
karel
50.5k11107127
To show what version of Java is installed without running java -version, open the terminal and type:
apt policy openjdk-* oracle-java*
A small part of the results of apt policy openjdk-* looks like this:
openjdk-7-jre-lib:
Installed: (none)
Candidate: (none)
Version table:
openjdk-8-jdk:
Installed: 8u162-b12-0ubuntu0.16.04.2
Candidate: 8u162-b12-0ubuntu0.16.04.2
Search for sections that contain either openjdk-*-jre , openjdk-*-jdk or oracle-java* where the wildcard * character can be a Java version number like 6, 7, 8 or 9.
answered Apr 13 at 8:53
karel
50.5k11107127
edited Apr 13 at 10:52
answered Apr 13 at 8:53
karel
50.5k11107127
answered Apr 13 at 8:53
karel
50.5k11107127
answered Apr 13 at 8:53
karel
50.5k11107127
50.5k11107127
thanks, with that command i got tons of lines which one should i search for?
– Zeno Raiser
Apr 13 at 8:57
add a comment |Â
thanks, with that command i got tons of lines which one should i search for?
– Zeno Raiser
Apr 13 at 8:57
thanks, with that command i got tons of lines which one should i search for?
– Zeno Raiser
Apr 13 at 8:57
thanks, with that command i got tons of lines which one should i search for?
– Zeno Raiser
Apr 13 at 8:57
add a comment |Â
up vote
4
down vote
You can discover the full path of the default java executable with:
readlink -f "$(which java)"
All (sane) Java packages or bundles that I know use installation path names that include the vendor name and major version number which would answer your question. E. g. on my system
$ readlink -f "$(which java)"
/usr/lib/jvm/java-9-openjdk-amd64/bin/java
tells me that the default Java installation is OpenJDK 9.
answered Apr 13 at 10:54
David Foerster
26.1k1361106
add a comment |Â
up vote
4
down vote
You can discover the full path of the default java executable with:
readlink -f "$(which java)"
All (sane) Java packages or bundles that I know use installation path names that include the vendor name and major version number which would answer your question. E. g. on my system
$ readlink -f "$(which java)"
/usr/lib/jvm/java-9-openjdk-amd64/bin/java
tells me that the default Java installation is OpenJDK 9.
answered Apr 13 at 10:54
David Foerster
26.1k1361106
add a comment |Â
up vote
4
down vote
up vote
4
down vote
You can discover the full path of the default java executable with:
readlink -f "$(which java)"
All (sane) Java packages or bundles that I know use installation path names that include the vendor name and major version number which would answer your question. E. g. on my system
$ readlink -f "$(which java)"
/usr/lib/jvm/java-9-openjdk-amd64/bin/java
tells me that the default Java installation is OpenJDK 9.
answered Apr 13 at 10:54
David Foerster
26.1k1361106
You can discover the full path of the default java executable with:
readlink -f "$(which java)"
All (sane) Java packages or bundles that I know use installation path names that include the vendor name and major version number which would answer your question. E. g. on my system
$ readlink -f "$(which java)"
/usr/lib/jvm/java-9-openjdk-amd64/bin/java
tells me that the default Java installation is OpenJDK 9.
answered Apr 13 at 10:54
David Foerster
26.1k1361106
answered Apr 13 at 10:54
David Foerster
26.1k1361106
answered Apr 13 at 10:54
David Foerster
26.1k1361106
answered Apr 13 at 10:54
David Foerster
26.1k1361106
26.1k1361106
add a comment |Â
add a comment |Â
up vote
2
down vote
You could also try:
dpkg -l | egrep -i 'jre|java|jdk'
edited Apr 13 at 10:50
David Foerster
26.1k1361106
answered Apr 13 at 10:17
muclux
2,1231522
add a comment |Â
up vote
2
down vote
You could also try:
dpkg -l | egrep -i 'jre|java|jdk'
edited Apr 13 at 10:50
David Foerster
26.1k1361106
answered Apr 13 at 10:17
muclux
2,1231522
add a comment |Â
up vote
2
down vote
up vote
2
down vote
You could also try:
dpkg -l | egrep -i 'jre|java|jdk'
edited Apr 13 at 10:50
David Foerster
26.1k1361106
answered Apr 13 at 10:17
muclux
2,1231522
You could also try:
dpkg -l | egrep -i 'jre|java|jdk'
edited Apr 13 at 10:50
David Foerster
26.1k1361106
answered Apr 13 at 10:17
muclux
2,1231522
edited Apr 13 at 10:50
David Foerster
26.1k1361106
edited Apr 13 at 10:50
David Foerster
26.1k1361106
edited Apr 13 at 10:50
David Foerster
26.1k1361106
26.1k1361106
answered Apr 13 at 10:17
muclux
2,1231522
answered Apr 13 at 10:17
muclux
2,1231522
answered Apr 13 at 10:17
muclux
2,1231522
2,1231522
add a comment |Â
add a comment |Â
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"I know that i have installed java 8 but i don't know precisely which version it is." Installed how?
– muru
Apr 13 at 12:14