卸载java 18并安装java 11之后，运行一个基于Java引发的程序“错误:找不到libjava.so”

Question

我想在一个托管在Windows 10主机操作系统上的virtualbox VM上的Ubuntu22.04操作系统中运行一个基于Java11 (盖瑟弗)的程序。

因为我以前安装了Java 18 (我按照下面的步骤安装了Java 18)，

1-通过以下本程序卸载Java 18

2-重新启动VM

3-通过运行

sudo apt update
sudo apt install openjdk-11-jdk

4-重新启动VM

但是，当我试图运行基于java的程序时，我得到了以下错误：

GEOSERVER DATA DIR is /usr/share/geoserver/data_dir
Error: could not find libjava.so
Error: Could not find Java SE Runtime Environment.

因此，我检查了我刚刚安装的java版本，然后我得到了

tommaso@tommaso-VirtualBox02:/usr/share/geoserver/bin$ javac -version
javac 11.0.17

tommaso@tommaso-VirtualBox02:/usr/share/geoserver/bin$ java -version
openjdk version "11.0.17" 2022-10-18
OpenJDK Runtime Environment (build 11.0.17+8-post-Ubuntu-1ubuntu222.04)
OpenJDK 64-Bit Server VM (build 11.0.17+8-post-Ubuntu-1ubuntu222.04, mixed mode, sharing)

因此，前面的java版本的卸载似乎并不顺利，并使事情变得一团糟，以致于之后的java 11安装无法正常工作。

我该怎么解决呢？

我会将问题排除在安装的程序中，因为土方根安装程序不涉及运行任何依赖于java版本的操作。

引发错误的文件-- startup.sh --的内容如下：

#!/bin/sh
set -o errexit
set -o nounset
IFS=$(printf '\n\t')
# -----------------------------------------------------------------------------
# Start Script for GEOSERVER
#
# $Id$
# -----------------------------------------------------------------------------
# Guard against misconfigured JAVA_HOME
if [ -n "${JAVA_HOME:-}" ] && [ ! -x "${JAVA_HOME}/bin/java" ]; then
  echo "The JAVA_HOME environment variable is set but JAVA_HOME/bin/java"
  echo "is missing or not executable:"
  echo "    JAVA_HOME=${JAVA_HOME}"
  echo "Please either set JAVA_HOME so that the Java runtime is JAVA_HOME/bin/java"
  echo "or unset JAVA_HOME to use the Java runtime on the PATH."
  exit 1
fi
# Find java from JAVA_HOME or PATH
if [ -n "${JAVA_HOME:-}" ]; then
  _RUNJAVA="${JAVA_HOME}/bin/java"
elif [ -n "$(command -v java)" ]; then
  _RUNJAVA=java
else
  echo "A Java runtime (java) was not found in JAVA_HOME/bin or on the PATH."
  echo "Please either set the JAVA_HOME environment variable so that the Java runtime"
  echo "is JAVA_HOME/bin/java or add the Java runtime to the PATH."
  exit 1
fi
if [ -z "${GEOSERVER_HOME:-}" ]; then
  #If GEOSERVER_HOME not set then guess a few locations before giving
  # up and demanding user set it.
  if [ -r start.jar ]; then
     echo "GEOSERVER_HOME environment variable not found, using current "
     echo "directory.  If not set then running this script from other "
     echo "directories will not work in the future."
     GEOSERVER_HOME="$(pwd)"
  else 
    if [ -r ../start.jar ]; then
      echo "GEOSERVER_HOME environment variable not found, using current "
      echo "location.  If not set then running this script from other "
      echo "directories will not work in the future."
      GEOSERVER_HOME="$(pwd)/.."
    fi
  fi 
  if [ -z "${GEOSERVER_HOME:-}" ]; then
    echo "The GEOSERVER_HOME environment variable is not defined"
    echo "This environment variable is needed to run this program"
    echo "Please set it to the directory where geoserver was installed"
    exit 1
  fi
  export GEOSERVER_HOME
fi
if [ ! -r "${GEOSERVER_HOME}/bin/startup.sh" ]; then
  echo "The GEOSERVER_HOME environment variable is not defined correctly"
  echo "This environment variable is needed to run this program"
  exit 1
fi
#Find the configuration directory: GEOSERVER_DATA_DIR
if [ -z "${GEOSERVER_DATA_DIR:-}" ]; then
    if [ -r "${GEOSERVER_HOME}/data_dir" ]; then
        export GEOSERVER_DATA_DIR="${GEOSERVER_HOME}/data_dir"
    else
        echo "No GEOSERVER_DATA_DIR found, using application defaults"
          GEOSERVER_DATA_DIR=""
    fi
fi
cd "${GEOSERVER_HOME}" || exit 1
if [ -z "${MARLIN_JAR:-}" ]; then
    MARLIN_JAR=$(find "$(pwd)/webapps" -name "marlin*.jar" | head -1)
    if [ "${MARLIN_JAR:-}" != "" ]; then
        MARLIN_ENABLER="-Xbootclasspath/a:${MARLIN_JAR}"
        RENDERER="-Dsun.java2d.renderer=org.marlin.pisces.MarlinRenderingEngine"
        export MARLIN_JAR MARLIN_ENABLER RENDERER
    fi
fi
echo "GEOSERVER DATA DIR is ${GEOSERVER_DATA_DIR}"
#added headless to true by default, if this messes anyone up let the list
#know and we can change it back, but it seems like it won't hurt -ch
IFS=$(printf '\n\t ')
exec "${_RUNJAVA}" ${JAVA_OPTS:--DNoJavaOpts} "${MARLIN_ENABLER:--DMarlinDisabled}" "${RENDERER:--DDefaultrenderer}" "-Djetty.base=${GEOSERVER_HOME}" "-DGEOSERVER_DATA_DIR=${GEOSERVER_DATA_DIR}" -Djava.awt.headless=true -DSTOP.PORT=8079 -DSTOP.KEY=geoserver -jar "${GEOSERVER_HOME}/start.jar"

Answer 1

解出

与我所想的相反，问题是程序(盖瑟弗)生成了一个配置文件(/etc/default/geoserver)，它在其中存储了安装的java版本

tommaso@tommaso-VirtualBox02:/etc/default$ cat geoserver
USER=tommaso
GEOSERVER_DATA_DIR=/usr/share/geoserver/data_dir
GEOSERVER_HOME=/usr/share/geoserver
JAVA_HOME=/usr/lib/jvm/java-18-openjdk-amd64
JAVA_OPTS="-Xms128m -Xmx512m"

由于该文件位于程序自己的文件夹之外，因此仅卸载和重新安装程序并不能解决问题。

为了解决这个问题，我遵循了本程序。