1 | <?xml version="1.0" encoding="UTF-8"?>
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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5 | %general-entities;
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6 | ]>
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7 |
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8 | <sect1 id="ojdk-conf" xreflabel="Configuring the Java environment">
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9 | <?dbhtml filename="ojdk-conf.html"?>
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10 |
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11 |
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12 | <title>Configuring the Java environment</title>
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13 |
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14 | <sect2 id="java-profile">
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15 | <title>Setting up the environment</title>
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16 |
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17 | <para>
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18 | After the package installation is complete, the next step is to make sure
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19 | that the system can properly find the files. If you set up your login
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20 | scripts as recommended in <xref linkend='postlfs-config-profile'/>, update
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21 | the environment by creating the <filename>openjdk.sh</filename> script,
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22 | as the <systemitem class="username">root</systemitem> user:
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23 | </para>
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24 |
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25 | <screen role="root"><userinput>cat > /etc/profile.d/openjdk.sh << "EOF"
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26 | <literal># Begin /etc/profile.d/openjdk.sh
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27 |
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28 | # Set JAVA_HOME directory
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29 | JAVA_HOME=/opt/jdk
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30 |
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31 | # Adjust PATH
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32 | pathappend $JAVA_HOME/bin
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33 |
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34 | # Auto Java CLASSPATH: Copy jar files to, or create symlinks in, the
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35 | # /usr/share/java directory.
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36 |
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37 | AUTO_CLASSPATH_DIR=/usr/share/java
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38 |
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39 | pathprepend . CLASSPATH
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40 |
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41 | for dir in `find ${AUTO_CLASSPATH_DIR} -type d 2>/dev/null`; do
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42 | pathappend $dir CLASSPATH
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43 | done
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44 |
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45 | for jar in `find ${AUTO_CLASSPATH_DIR} -name "*.jar" 2>/dev/null`; do
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46 | pathappend $jar CLASSPATH
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47 | done
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48 |
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49 | export JAVA_HOME
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50 |
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51 | # By default, Java creates several files in a directory named
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52 | # /tmp/hsperfdata_[username]. This directory contains files that are used for
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53 | # performance monitoring and profiling, but aren't normally needed on a BLFS
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54 | # system. This environment variable disables that feature.
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55 | _JAVA_OPTIONS="-XX:-UsePerfData"
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56 |
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57 | export _JAVA_OPTIONS
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58 |
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59 | unset AUTO_CLASSPATH_DIR dir jar _JAVA_OPTIONS
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60 |
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61 | # End /etc/profile.d/openjdk.sh</literal>
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62 | EOF</userinput></screen>
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63 |
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64 | <para>
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65 | If <xref linkend="sudo"/> is installed, the super user should have
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66 | access to the above variables. Execute the following commands as the
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67 | <systemitem class="username">root</systemitem> user:
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68 | </para>
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69 |
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70 | <screen role="root"><userinput>cat > /etc/sudoers.d/java << "EOF"
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71 | <literal>Defaults env_keep += JAVA_HOME
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72 | Defaults env_keep += CLASSPATH
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73 | Defaults env_keep += _JAVA_OPTIONS</literal>
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74 | EOF</userinput></screen>
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75 |
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76 | <para>
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77 | To use <command>mandb</command> to include the OpenJDK man pages
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78 | in its database, issue, as the <systemitem class="username">root
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79 | </systemitem> user:
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80 | </para>
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81 |
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82 | <screen role="root"><userinput>cat >> /etc/man_db.conf << "EOF" &&
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83 | <literal># Begin Java addition
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84 | MANDATORY_MANPATH /opt/jdk/man
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85 | MANPATH_MAP /opt/jdk/bin /opt/jdk/man
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86 | MANDB_MAP /opt/jdk/man /var/cache/man/jdk
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87 | # End Java addition</literal>
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88 | EOF
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89 |
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90 | mkdir -p /var/cache/man &&
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91 | mandb -c /opt/jdk/man</userinput></screen>
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92 |
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93 | </sect2>
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94 |
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95 | <sect2 id="ojdk-certs" xreflabel="installing the JVM Certificate Authority Certificates">
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96 |
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97 | <title>Setting up the Certificate Authority Certificates for Java</title>
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98 |
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99 | <para>
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100 | <application>OpenJDK</application> uses its own format for the
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101 | CA certificates. The Java security modules use
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102 | <envar>$JAVA_HOME</envar><filename>/lib/security/cacerts</filename> by
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103 | default. In order to keep all the certificates in one place, we use
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104 | <filename>/etc/ssl/java/cacerts</filename>. The instructions
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105 | on the <xref linkend="make-ca"/> page previously created the file
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106 | located in <filename class="directory">/etc/ssl/java</filename>.
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107 | Set up a symlink in the default location as the
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108 | <systemitem class="username">root</systemitem> user:
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109 | </para>
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110 |
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111 | <screen role="root"><userinput>ln -sfv /etc/pki/tls/java/cacerts /opt/jdk/lib/security/cacerts</userinput></screen>
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112 |
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113 | <para>
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114 | Use the following command to check if the <filename>cacerts</filename>
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115 | file has been successfully installed:
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116 | </para>
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117 |
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118 | <screen role="root"><userinput>/opt/jdk/bin/keytool -list -cacerts</userinput></screen>
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119 |
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120 | <para>
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121 | At the prompt <computeroutput>Enter keystore password:</computeroutput>,
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122 | enter <userinput>changeit</userinput> (the default) or just press the
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123 | <quote>Enter</quote> key. If the <filename>cacerts</filename> file was
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124 | installed correctly, you will see a list of the certificates with
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125 | related information for each one. If not, you need to reinstall them.
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126 | </para>
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127 |
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128 | <para>
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129 | If you later install a new JVM, you just have to create the symlink in
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130 | the default location to be able to use the cacerts.
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131 | </para>
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132 |
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133 | </sect2>
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134 |
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135 | </sect1>
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