Python中ImageJ启动失败：CalledProcessError与Java版本问题

此前可正常运行的代码：

import imagej

ij = imagej.init()

重启电脑后执行报错：

CalledProcessError: Command '['C:\\path\\to\\java\\bin\\java.exe', '-version']' returned non-zero exit status 1.

完整堆栈追踪：

CalledProcessError                        Traceback (most recent call last)
Input In [11], in <cell line: 3>()
      1 import imagej
----> 3 ij = imagej.init()

File ~\anaconda3\lib\site-packages\imagej\__init__.py:1496, in init(ij_dir_or_version_or_endpoint, mode, add_legacy, headless)
   1493     raise EnvironmentError("Sorry, the interactive mode is not available on macOS.")
   1495 if not sj.jvm_started():
-> 1496     success = _create_jvm(ij_dir_or_version_or_endpoint, mode, add_legacy)
   1497     if not success:
   1498         raise RuntimeError("Failed to create a JVM with the requested environment.")

File ~\anaconda3\lib\site-packages\imagej\__init__.py:1603, in _create_jvm(ij_dir_or_version_or_endpoint, mode, add_legacy)
   1601     sj.config.add_option("-Djava.awt.headless=true")
   1602 try:
-> 1603     if hasattr(sj, "jvm_version") and sj.jvm_version()[0] >= 9:
   1604         # Disable illegal reflection access warnings.
   1605         sj.config.add_option("--add-opens=java.base/java.lang=ALL-UNNAMED")
   1606         sj.config.add_option("--add-opens=java.base/java.util=ALL-UNNAMED")

File ~\anaconda3\lib\site-packages\scyjava\_java.py:140, in jvm_version()
    137 if java is None:
    138     raise RuntimeError(f"No java executable found inside: {p}")
-> 140 version = subprocess.check_output(
    141     [str(java), "-version"], stderr=subprocess.STDOUT
    142 ).decode()
    143 m = re.match('.*version "(([0-9]+\\.)+[0-9]+)', version)
    144 if not m:

File ~\anaconda3\lib\subprocess.py:424, in check_output(timeout, *popenargs, **kwargs)
    421         empty = b''
    422     kwargs['input'] = empty
-> 424 return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
    425            **kwargs).stdout

File ~\anaconda3\lib\subprocess.py:528, in run(input, capture_output, timeout, check, *popenargs, **kwargs)
    526     retcode = process.poll()
    527     if check and retcode:
-> 528         raise CalledProcessError(retcode, process.args,
    529                                  output=stdout, stderr=stderr)
    530 return CompletedProcess(process.args, retcode, stdout, stderr)

CalledProcessError: Command '['C:\\Users\\andre\\anaconda3\\Library\\bin\\bin\\java.exe', '-version']' returned non-zero exit status 1.

从报错路径C:\\Users\\andre\\anaconda3\\Library\\bin\\bin\\java.exe可以看出，自动检测的Java路径存在重复的bin目录，导致路径无效，无法执行java -version命令。

• 验证并修复系统Java路径

  1. 打开命令提示符，输入where java，找到有效的Java可执行文件路径（比如C:\Program Files\Java\jdk-xx.x.x\bin\java.exe，或者Anaconda正确路径C:\Users\andre\anaconda3\Library\bin\java.exe）
  2. 检查环境变量：确保JAVA_HOME指向JDK/JRE的根目录，PATH中包含Java的bin目录，且该路径在Anaconda相关路径之前（避免路径冲突）

• 手动指定imagej的Java路径
  绕过自动检测，直接在代码中指定正确的Java路径：

  import imagej
  import scyjava
  
  # 方式1：指定JDK/JRE根目录
  scyjava.config.add_option('-Djava.home=C:\\Users\\andre\\anaconda3\\Library')
  # 方式2：直接指定java.exe路径
  # scyjava.config.add_option('-Djvm.path=C:\\Users\\andre\\anaconda3\\Library\\bin\\java.exe')
  
  ij = imagej.init()
  

• 修复Anaconda自带的Java环境
  如果是Anaconda内置的Java出现路径错误，尝试重装相关包：

  conda uninstall openjdk -y
  conda install openjdk -y
  

内容的提问来源于stack exchange，提问作者Andres