documents:120329javatips
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| documents:120329javatips [2016/09/26 23:46] – [Running single instance ImageJ (in OSX)] kota | documents:120329javatips [2020/11/26 09:11] (current) – external edit 127.0.0.1 | ||
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| I encountered this message when there is a conflict by having two same jar files in the class path. Removing one of them should over come this error. There seems to be more to it as an explanation, | I encountered this message when there is a conflict by having two same jar files in the class path. Removing one of them should over come this error. There seems to be more to it as an explanation, | ||
| - | <quote> | + | <blockquote> |
| This happens when classes belonging to the same package are loaded from different JAR files, and those JAR files have signatures signed with different certificates - or, perhaps more often, at least one is signed and one or more others are not (which includes classes loaded from directories since those AFAIK cannot be signed). | This happens when classes belonging to the same package are loaded from different JAR files, and those JAR files have signatures signed with different certificates - or, perhaps more often, at least one is signed and one or more others are not (which includes classes loaded from directories since those AFAIK cannot be signed). | ||
| So either make sure all JARs (or at least those which contain classes from the same packages) are signed using the same certificate, | So either make sure all JARs (or at least those which contain classes from the same packages) are signed using the same certificate, | ||
| - | </quote> | + | </blockquote> |
| ===== Extract compiler version from a class file ===== | ===== Extract compiler version from a class file ===== | ||
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| javap -verbose MyClass | head | javap -verbose MyClass | head | ||
| </ | </ | ||
| - | <quote> | + | <blockquote> |
| Java 1.2 uses major version 46\\ | Java 1.2 uses major version 46\\ | ||
| Java 1.3 uses major version 47\\ | Java 1.3 uses major version 47\\ | ||
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| Java 6 uses major version 50\\ | Java 6 uses major version 50\\ | ||
| Java 7 uses major version 51\\ | Java 7 uses major version 51\\ | ||
| - | </quote> | + | </blockquote> |
| ** JAR file ** | ** JAR file ** | ||
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| By the way, as of 20150620: | By the way, as of 20150620: | ||
| - | <quote> | + | <blockquote> |
| The current ImageJ Launcher only looks for Java SE installations in / | The current ImageJ Launcher only looks for Java SE installations in / | ||
| - | </quote> | + | </blockquote> |
| [[https:// | [[https:// | ||
| ===== Generating Javadoc ===== | ===== Generating Javadoc ===== | ||
documents/120329javatips.1474933604.txt.gz · Last modified: 2016/09/26 23:46 by kota