René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Using --release compiler option vs -source and -target","articleBody":"I ran into a problem with building BigVolumeViewer with JDK 11 (and Maven).\r\n\r\n```\r\npietzsch@mycroft:~/workspace/bigdataviewer/bigvolumeviewer-core (master)$ mvn clean install                                                                                                           # 1 [15:22:38]\r\n[INFO] Scanning for projects...\r\n[INFO]\r\n[INFO] ----------------------\u003c sc.fiji:bigvolumeviewer \u003e-----------------------\r\n[INFO] Building BigVolumeViewer 0.3.2-SNAPSHOT\r\n[INFO] --------------------------------[ jar ]---------------------------------\r\n...\r\n[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ bigvolumeviewer ---\r\n[INFO] Compiling 103 source files to /Users/pietzsch/workspace/bigdataviewer/bigvolumeviewer-core/target/classes\r\n[INFO] /Users/pietzsch/workspace/bigdataviewer/bigvolumeviewer-core/src/main/java/bvv/vistools/BvvFunctions.java: Some input files use or override a deprecated API.\r\n[INFO] /Users/pietzsch/workspace/bigdataviewer/bigvolumeviewer-core/src/main/java/bvv/vistools/BvvFunctions.java: Recompile with -Xlint:deprecation for details.\r\n[INFO] -------------------------------------------------------------\r\n[ERROR] COMPILATION ERROR :\r\n[INFO] -------------------------------------------------------------\r\n[ERROR] /Users/pietzsch/workspace/bigdataviewer/bigvolumeviewer-core/src/main/java/bvv/core/blocks/ByteUtils.java:[36,16] package sun.misc does not exist\r\n[ERROR] /Users/pietzsch/workspace/bigdataviewer/bigvolumeviewer-core/src/main/java/bvv/core/blocks/ByteUtils.java:[41,30] cannot find symbol\r\n  symbol:   class Unsafe\r\n  location: class bvv.core.blocks.ByteUtils\r\n[INFO] 2 errors\r\n[INFO] -------------------------------------------------------------\r\n...\r\n```\r\n\r\nThis can be traced back to the `maven-compiler-plugin` configuring `javac` with `--release 8`.\r\n\r\nThe problem is that `--release 8` works slightly different that the old-style `-source 1.8 -target 1.8`.\r\nSee https://bugs.openjdk.org/browse/JDK-8214165, https://bugs.openjdk.org/browse/JDK-8206937, https://mail.openjdk.org/pipermail/compiler-dev/2018-January/011583.html.\r\nThe spec for `--release N` is to provide access to the public documented API for `JDK N`. The `sun.misc` package is not public documented API.\r\n\r\nIronically, if we were targeting Java 11, there would be no problem. `--release 11` would work, because there is the `jdk.unsupported` module ...\r\n\r\nAnyway... I think this can be traced to\r\nhttps://github.com/scijava/pom-scijava-base/blob/8920b4fd8a74997dc245b7ce712e63b3a97dabd5/pom.xml#L2107-L2125\r\nwhere the `\u003cmaven.compiler.release\u003e` property is set.\r\n\r\nThe only way I found to fix that in BigVolumeViewer's pom.xml is https://github.com/bigdataviewer/bigvolumeviewer-core/commit/ffaf291987da4ea3e4ca9796a700b43c5209c8be\r\nhttps://github.com/bigdataviewer/bigvolumeviewer-core/blob/ffaf291987da4ea3e4ca9796a700b43c5209c8be/pom.xml#L83-L95\r\n\r\nIt would be nicer to address this higher up, but I don't know how pom-scijava-base should be changed exactly, and what side effects would be.\r\n","author":{"url":"https://github.com/tpietzsch","@type":"Person","name":"tpietzsch"},"datePublished":"2023-08-23T14:01:28.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/34/pom-scijava-base/issues/34"}