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<p style="margin: 10px 0 0 0">You may all have achieved Borg Perfection, but I haven't. So without an available edit button I'll just have to elaborate further in a comment.</p>
<p style="margin: 10px 0 0 0">These are the mappings for which <tt>hbm2ddl</tt> generates <tt>NOT NULL</tt> constraints, despite my doing everything in my power to have these columns made nullable instead:</p>
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<b>BadThing</b>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@OneToOne(optional = <span class="code-keyword" style="color: #000091">true</span>)
@JoinColumns({
@JoinColumn(name = <span class="code-quote" style="color: #009100">"id"</span>, referencedColumnName = <span class="code-quote" style="color: #009100">"thing_id"</span>, nullable = <span class="code-keyword" style="color: #000091">true</span>, updatable = <span class="code-keyword" style="color: #000091">true</span>),
@JoinColumn(name = <span class="code-quote" style="color: #009100">"current_thing_data"</span>, referencedColumnName = <span class="code-quote" style="color: #009100">"created"</span>, nullable = <span class="code-keyword" style="color: #000091">true</span>, updatable = <span class="code-keyword" style="color: #000091">true</span>)
})
@MapsId(<span class="code-quote" style="color: #009100">"id"</span>)
<span class="code-keyword" style="color: #000091">private</span> BadThingData currentData;
</pre>
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<p style="margin: 10px 0 0 0">Generated schema:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
sql> show columns from bad_thing;
FIELD | TYPE | NULL | KEY | DEFAULT
ID | BIGINT(19) | NO | PRI | (NEXT VALUE FOR PUBLIC.SYSTEM_SEQUENCE_85A1C07C_67FF_454A_B608_465214803984)
LOCK | INTEGER(10) | NO | | NULL
NAME | VARCHAR(255) | NO | UNI | NULL
CURRENT_THING_DATA | TIMESTAMP(23) | NO | | NULL
</pre>
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<p style="margin: 10px 0 0 0">And similarly for my tree-structure, where the root node <em>must</em> have a null parent:</p>
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<b>BadItemNode</b>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@ManyToOne(fetch = FetchType.LAZY, optional = <span class="code-keyword" style="color: #000091">false</span>)
@JoinColumns({
@JoinColumn(name = <span class="code-quote" style="color: #009100">"tree_id"</span>, referencedColumnName = <span class="code-quote" style="color: #009100">"tree_id"</span>, nullable = <span class="code-keyword" style="color: #000091">true</span>, updatable = <span class="code-keyword" style="color: #000091">false</span>),
@JoinColumn(name = <span class="code-quote" style="color: #009100">"parent_id"</span>, referencedColumnName = <span class="code-quote" style="color: #009100">"item_id"</span>, nullable = <span class="code-keyword" style="color: #000091">true</span>, updatable = <span class="code-keyword" style="color: #000091">false</span>)
})
@MapsId(<span class="code-quote" style="color: #009100">"id.treeId"</span>)
<span class="code-keyword" style="color: #000091">private</span> BadItemNode parent;
</pre>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
sql> show columns from bad_item_node;
FIELD | TYPE | NULL | KEY | DEFAULT
ITEM_ID | BIGINT(19) | NO | PRI | NULL
TREE_ID | BIGINT(19) | NO | PRI | NULL
PARENT_ID | BIGINT(19) | NO | | NULL
</pre>
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<p style="margin: 10px 0 0 0">I have generated workarounds with entities <tt>Item</tt> and <tt>ItemNode</tt>, but I am thinking that these are different examples of the same underlying problem.</p>
<p style="margin: 10px 0 0 0">Full class definitions with failing JUnit tests are included in the attached Maven project. (Note that the JUnit tests for the workaround entities run correctly).</p>
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